there are three currently that either didn't have answers or didn't go into much depth that i'll try to knock out pretty quickly -- "Dashing" Cody Rhodes, Christian and Kaval.
Dashing Cody Rhodes -- start by teaming up with big brother Goldust. maybe even win the tag titles in the end there. this may already seem to be predictable, but the obvious option would then be to lose the belts and have Cody attack Goldie. kinda like when Owen turned on Bret. this could be built up much the same way with a long storyline and eventual feud. after turning on Goldie, he could go on to feud with guys like Chavo, Rey and Orton... guys that are not 1st generation stars and could help elevate Cody to the main event. granted, Chavo couldn't do that on his own because he's not in the main event himself. but Orton and Rey are and they'd be believable feuds. the start with Goldie would just to help get Cody more established and to give the fans a reason to watch and care about him for awhile. plus, with Goldie, he can brush up on his ring work and mic skills, as Goldie is one of the best out there today still.
Christian -- move him to Raw and put him in a stable with Jericho and Edge. these three have amazing history together with tag titles between any combination of the two and feuds to go along with it. also, they're all from Canada, so there's some possible reason to stable them together. also, they're great in the ring and on the mic and all are very capable of being tweeners, face or heel. stick Christian in the stable. as Edge and Jericho battle for leadership, have Christian be the only one with a title in the stable and make him the unexpected leader, eventually going for the WHC. maybe this would lead to a great Cena feud... first off, Cena has feuded with all three, so there's some history there. and besides being "super Cena", Cena is also "the Marine", a la the all-american boy. so having him feud with some Canadian guys could work too. plus Edge and Jericho are already wanting to feud with Cena, so it makes sense. long story short, put Christian on Raw in a stable with Edge and Jericho and have all three feud with Cena. maybe even let them win for a change.
Kaval -- too soon to tell, but a good run on NXT couldn't hurt. i don't think he'll be this year's winner though. too many good guys in this competition that might beat him out. but win or lose, a program with Danielson could be pretty amazing. they both have pretty extensive history with the Indy Scene and so there's some not-well-known history there perhaps to dig from in a feud. plus Danielson is one of the most talked about guys around right now. stick him in a feud with Danielson and Miz in a triangle match or triangle feud. or go a different route and pair him up with Alberto del Rio and have them take out Rey. this would get immediate heat and put him in upper mid card to possible main event in the future.
next in the Main Event Scene: Kofi Kingston