Actually if you think about everything; WWE logically has done well with this feud and people will not give them the time of day to think about all the little detais of the start of this feud. Let's start from the beginning:
Punk was announced as Darren Young's mentor on NXT 1. Punk hates Darren Young and wants nothing to do with him. Darren Young gets elminated on NXT and Punk then starts to act even more distant than before. He stops caring about the competitons nor about who wins them. However if you noticed every week from NXT when someone's elminiated; they say they'll be back up until Wade Barrett wins NXT.
June 7th, 2010: WWE fans vote CM Punk as Cena's opponent (odd occurance in itself when REY MYSTERIO was an option). Punk v. Cena happens and Nexus comes out and takes out Punk (for a brief second minus Darren Young and Daniel Bryan). They then focus their attacks on Justin Roberts, The King, the numerous ring crew, and that tie (and Cena too).
Over the course of the next few weeks and months; Nexus tortures the WWE roster taking out Bret Hart, Chris Jericho (NXT pro), R-Truth (NXT pro), John Morrison (NXT pro), and others like Edge that didn't matter. A good portion of the people Nexus attacked for a while were NXT related or WWE ME'ers until they needed credibility and attacked jobbers. Nexus feuds with Cena and team WWE and loses when Nexus reject Daniel Bryan (who'd been kicked out for feeling REMORSE) returns.
Next week, after Nexus notices weak links; they kick out Darren Young (pay attention to this) and further the feud with Cena. They go on a war path for the WWE title and lose until they see Cena again. Cena then feuds with them at HIAC and becomes a member. During this time, Cena gets IM'd by the Raw GM stating if he doesn't follow through with his PROMISE, he'd be fired. Also during this time, Cena starts feuding with Evan Bourne (the man he gives a rub to earlier in the year BRIEFLY) and starts to try to tear Nexus apart from the inside (which new Raw GM still didn't want and thought ahead). During this time, the mysterious Raw GM announces a trade into getting Edge off his case and brings back CM Punk to Raw. Punk then attacks Evan and makes an example out of him.
Survivor Series rolls around and Cena finds a way out of Nexus. He takes the fired option and then goes into business for himself. Cena starts attacking the Nexus members (who are fighting amongst each other and might I add have a dirty secret of a higher power AND reasons for attacking Taker too which David wants to reveal, but Wade doesn't). Cena then gets his match and job back from Barrett and Barrett loses and gets destroyed.
Enter the last two weeks: Punk starts calling Cena out on commentary. He mentions that it's not impressive to take Wade Barrett out with chairs (caught that line anyone?). He mentions Cena doesn't follow through with his promises (caught that one anyone?). And that he wants to write the wrongs (anyone catch that line too last night?). WWE lined Punk up for this role way before we thought. I actually caught that Barrett line from Punk two weeks ago on Raw and I wondered when Punk would be called into the Nexus and boy was I right. Punk's been anti-Cena on commentary SINCE he started which got me wondering why.
Now that all the details have surfaced; I expect (hopefully) that this Punk and Nexus thing has more depth than just CM PUNK being a cult leader and took advantage of an opportunity of a leadership change (that sounds more like an Edge gimmick). While Edge is an opporunist; Punk's more like everyone's said; a manipulative mastermind. He sees an advantage, but he crafts things more effectively. See the Rey Mysterio feud a little bit for more details. He crafted each move, and while he lost, that could have been the start of his hatred for SES.
Let's go back to NXT 1. When Darren Young got out; maybe Punk started to make his rounds by then with the rookies. Maybe he told them all he could get them all jobs. Then let's say the rookies agreed, but brought Darren Young into the mix. Punk started to then show annimosity towards the SES and threatened to get rid of them. Funny thing, SES was attacked more than Punk. Punk secretly sent them a message, then finally delievers the killing blow to the group before he's moved to Raw...
While off Raw, Punk watched Nexus and fed them moves. Punk was more like the "higher power" that Vince was back during the attitude. How would Punk possibly feed the Nexus moves and humble them? Well he might have created an alias to become the mysterious Raw GM. That's going on a limb but any time Cena got involved, GM would humble him. Punk could have used the role to recruit members (like Daniel Bryan), humble mentors (Miz, Truth, Morrison, etc), and even just fuck around with WWE Raw. If not, then Punk befriends the Raw GM, and manipulates moves like keeping Cena at bay.
Now as Jericho and Punk left, they wanted to find out who this GM was. The GM (no matter how the storyline goes above) didn't want to have people find out who he was; so he transported Edge to SD, to trade for his friend (or himself) in order to make a move. During this time; Punk neither referrenced Nexus and they didn't go for him. They kept distant for a long time. This could have been done for allusion. But during the time, might I add to jump around, Punk views what happens to Darren Young, and cuts him too. Punk gets angry and tries to elminate him and successfully does (notice how he could have puppetted the matches through his partnership with Wade Barrett).
Now, when Punk comes to Raw, Nexus had attacked Undertaker. At this time; we could have had the background discention of Nexus. Punk, being the kind leader (notice how he can do that at times with SES), co-ereced the Nexus rookies to keep quiet and be nice, but then this is when the individual atttiudes come back into play. Wade wants to keep people quiet about the higher power, but David wants to reveal it. Hmmm, see kind of fishy? Well Wade's a bully and Punk's the guy the rookies might have liked because he could have trained them.
Now, this is where Wade's pride could have set in and cost him against Cena and put Nexus into a tight place. Punk may have wanted to humble Barrett and then forced the rookies to walk on him if he didn't take the chairs match. Wade does and Punk kicks Barrett out. Grant it, Punk might have just humbled Barrett.
I see this angle playing two ways: one, WWE acknowledges a lot of what I did and brings Wade back into the mix of Nexus the following week. Punk tells Nexus that Barrett's now a lackey and this is when things get interesting and building towards Barrett's slow and sudden face turn. Barrett gets tired of being treated like Punk's bitch. Cena, who's worked under the Punk/Barrett regime, talks to Wade and tries to get them to team up. Barrett tries to go it alone and gets Nexus beat down. Cena keeps helping, and Wade then finally teams up with Cena to take on Nexus at WM or guest refs Punk v. Cena.
Second Route: I see them throwing all the work of thought (which sadly, they could get away with it even if half of this shit was off the cuff), and have Punk 'take over.' This would lead to Nexus's eventual burial through Barrett (the guy who starts it) and Cena beating Punk (once again at WM) thus killing credibilty of Nexus.
Honestly, I'd like to see more thought placed into this angle. WWE left us with a wide open door to actually DO SOMETHING GOOD. Could they captialize?