Who's going to beat Nadal at Wimbledon though?
I just don't see him losing in the early rounds against an outsider again. Of course Djokovic can beat him but grass isn't his best surface and I can see Nadal getting the better of him if they play, I think there's also a high chance that Djokovic might go out before the final next year so then they won't even play. Andy could beat him as well but there's always that big doubt with Andy playing against Nadal, I put Nadal a big favourite against Andy still in a slam.
With the way Nadal was playing last year he looks easily good enough to win SW19.
Who's going to beat him at Wimbledon? There's plenty of players that could. In the top 10, I can definetely see Djokovic, Tsonga, Murray and Del Potro beating him on grass, heck even Berdych, if he doesn't play like a bitch, or Frauderer, if he can find his top form can beat Nadal on the green. Other players I see beating him on grass include Janowicz.
Also I'm not sure why you're bringing up the way he played last year as a measurement of how he is going to do on grass this year. Let me remind you that the majority of his good form came on hard courts, which play very differently to grass. Besides, Nadal did fall off to the end of the season and he has never backed up a really good season with another really good season, the following seasons are usually pretty poor for him.