No, he didn't get less agile against strong teams. Against strong teams it's more easily to notice that his Agi not so great at all. He trying to do some crazy moves, but can't pull them off, cause he isn't so crazy agile. Even against Palmeiras you can see his lack in DA and AGI to beat their sloppy defenders. Currently, MJ is very overrated, I'll put suggestions in Fluminense thread later.
About W. Nem, can't see him with more than 90, he's surely not more agile than this. Maybe Patito is slightly overrated (Vickingo made him with extreme values to replicate how gifted he is in fast dribbles and how weak in other things), can't see wrong to put him 89 or something.
BTW, finally maybe you are right, cause I'm playing 2013 and here all players are so fucking agile that I don't know for replicate what he needs 92. And in 2011, where game balance is much better, 92 could be good number for Osvaldo.