Maybe you are right that the novak starting to decline comment was an exaggeration... but novak would not have lost to nadal in the FO last year is what i was trying to say.
Anyhow, berdych/tsonga won't beat nadal on grass. Djokovic can (and he has), but i believe his performance last year was an anomaly (lets see if he can prove me wrong
Nadal won't lose to federer ever again.
And why won't he lose to Fed? As i remember, Fed beat him 2 out the last 3 times they played.
Nadal and Djokovic are the guys to beat, but they will for sure lose some matches to other guys. It may be on a slam as well. They can have an off day or someone can have a huge day, Isner serving lights out (IW comes to mind). Fed can beat Rafa when Rafa is not in form and he is. In form Rafa beats him, yes, but you never know what can happen, I just hate people saying things based on 1 match or 1 tournament. What if Novak won the RG, could you garantee that Rafa won't win W or USO? Any form has to stop sooner or later, and I can't imagine Rafa playing whole season in top form, bcs, well, he never could do that. He allways had eather a slow start to the season or bad season ending