No, just that he was unhappy he wasn't played with him as much as he liked previously. I assume when he was played with Sheahan either in the POs or the RS - I just can't remember when I read about it, but it was something that was reported that he was unhappy because he wasn't playing with Malkin. I would assume that he would have also been content if he'd been playing with Crosby...
Honestly I don't blame him.
@mrjiggyfly isn't wrong in that we're probably one of the few (if only) teams in recent years that has someone of Kessel's caliber, and then willingly chooses to play him on the third line (and not out of punishment). And for Kessel, I can understand him being a little miffed about being on L3 when we have 2 of the best centers in the league... and we're not playing him with either of them. No offense to Brassard, but he's doesn't even approach Crosby's and Malkin's level, and as much as I'm a fan of Sheahan - he's a few levels below Brassard.
That said... as a fan I can look at the reasons why we want him on L3 and how that should benefit the team more so then him on L1/L2.