Ric Flair is the "shoe in" for most people, in terms of impact, even in a 6 month period he did "change things", showing "the big gold belt" on WWE TV, his mini feud with Piper, winning the Royal Rumble from #3 to lift the title and the EXTREMELY well done feud and match with Savage at Mania showed WWE were going in a different, more mature direction. The "doctored photos" angle with Elizabeth was pretty risque for the WWF and it was not a Hoganesque "misunderstanding", it was played realistic and based on far more sexual connotations ("She was MINE first") than ever.. Flair played it perfectly, even his unauthorised blade job made the angle far more real that anything since Bruno's broken neck.
BUT...
Flair not being there for those 6 months from Mania to September/October really do damage his claim.
Here are the contenders:-
Roddy Piper - Yep, Hot Rod was a serious MVP in that year... while he started off injured managing Virgil, he still played a big part in that angle culminating at Summerslam 91 and by then he was fit and ready to go. His work on the colour was strong but he came into his own in that latter period where Flair debuted... He was not only the right guy to face Flair but managed to make Flair look amazing without a one on one match going down. He did so well Vince noticed and decided to position him for a match to help Bret Hart get to the next level and thus he won his only WWF belt, the Intercontinental title at The Royal Rumble. It didn't last long but Piper was an excellent IC champion, arguably one of the last who made it seem like the "IC Champ was the #1 contender", the match he put on with Bret was one of the best, IC title matches, only really behind Savage/Steamboat at the time, although surpassed by Bret and Davey months later it still holds up... That was Hot Rod's best year on the roster since 1985 and arguably was better than that in many ways, not only was he massively over, able to sell a show as IC champ but in ring he was at the best he was ever in the WWF... arguably the choice of opponents and his injuries held him back before this period, but he was finally let loose to show what he could do and he has a big claim to this MVP honor.
Jake Roberts - What might have been sums it up, but there was no one more over than Jake The Snake when he began his series of vignettes "training" The Ultimate Warrior. It was genuinely shocking when he turned heel on him... fans were crushed but a star was born... BUT
Something happened... much is made of Vince not "giving him the creative job" he was promised... but Jake was clearly in the grip of demons at that period too. Did Warrior refuse the job as he had the year prior for Rude? It's entirely possible and perhaps the most likely reason Jake was relegated to a "rushed" alliance with the Undertaker. Even then he made gold of it with his second "blockbuster" angle of the year... Randy Savage and the Cobra. At the time it was the most shocking moment in WWF history to see the "clear liquid" near wound on Savage's arm... devenomised or not, this didn't look fake... it looked like a real bite and that Randy was in serious trouble. Again...something happened and the angle didn't culminate as planned with their Survivor Series encounter... it was bumped to the failed Tuesday In Texas PPV and Jake was removed from the tradition match, leaving a very conspicuous, awkward match. I think this was the period that relations truly broke down and the decision/request to leave was made by Jake and Vince allowed it if he put Taker over. The feud with Taker was still top notch work from Jake, even if the match smelled of burial in the political sense rather than the Taker's gimmick... it didn't need to be so short, or even Taker face... but ultimately Taker's 2nd win of 21 set the tone and paved the way, while it was very nearly the last hurrah for Jake... only Steve Austin's verbal beatdown saved him from being "just another failed guy". But make no mistake, in terms and TV and for the fans... Jake was at the peak of his powers in this period, it was only political garbage and Jake's own demons that ended it. When the light was on... no one was better.
The Rockers - This was the beginning of the nadir of the WWF Tag team division. The Harts split immediately after Mania, Demolition were gone... suddenly the division had a lot of very bad teams thrown into it... The Beverly Brothers, the new Orient Express, The New Foundation and later High Energy. The Natural Disasters could have been great but were booked terribly... and Power and Glory likewise and the Nasty Boys simply didn't work in the WWF... but the saving grace of the division in that early part of 1991 was Shawn and Marty... if ever there seemed a time they were going to get their due it was then...momentum was building, then the odd mismove or Shawn getting eliminated at the Survivor Series. It was highly compelling stuff. When the two got to the Barbershop it was a truly pivotal moment, because it seemed that the Rockers refocused would be now pushed as THE team... when the kick heard around the world was made.
Go back and watch that Barbershop segment... even 23 years later it is the best executed turn in history... it ruined Rockers fans dreams, created a new star and sadly began the end of Marty's career through little fault of his own... While the Flair/Savage feud was based on sex, this was the most violent thing ANY WWF fan had ever seen. It wasn't Andre ripping a shirt to take Hogan's cross... or even Randy getting bit by a Cobra... this was nasty. Janetty's part can't be understated by anyone... blade job, hardway however that blood came, it made Shawn's career. We'd never seen anything so brutal, calculated and as wounding to us as fans as to the poor bastard taking the beating. Then came THE moment where Shawn literally became the Heartbreak Kid and history was changed. When he smugly adjusted his jacket and smirked.
It really COULD have gone either way, Vince could have kept the Rockers together another year, given them the belts...THEN made the turn and they would already be a HOF level team and maybe some of his acquisitions would have worked better. But to be in that position where there truly is a win/win, at the time for both members of the team to be pushed was almost unheard of and a real testament to BOTH members of that team. Ironically that win/win became known as the most unfair insult that can be levelled at any wrestler... the Marty Jannetty of the team. Janetty was a great worker before Shawn screwed him for real... any guy fired unfairly as he was would turn to drink etc... the damage was done and the Jannetty from that day on was not the same.
So...
I really want to give this to the Rockers.... they were that good and they never get any credit... They were arguably the most over faces behind Hogan and Warrior at the time... but I just can't let them have it over Flair... As good as the Rockers were and how that year for them changed the course of the WWF/E forever, Flair really did change the game the most radically. I call it a tie...