I just don't buy that mate, but no facts can really prove or disprove what went wrong so I'll leave you with your opinion and I'll keep mine!
One key difference with Yak at Blackburn is that he's the main man for them and is definitely loved. Maybe here, when Saha became our number one, it affected him. I don't know really -- just a theory.
As for any rumours about pay rises or whatever... well they're rumours. I've not seen anyone with any reputation for inside knowledge spout these things, but if they have or do, then fair enough. I'll reassess my opinion of Yakubu somewhat.
But the bottom line for me is that, in October 2010, for a brief period, he looked boss and was putting in the effort and reaping some rewards. He was dropped inexplicably for Saha and then that was pretty much it. On the face of it, I don't really blame Yak after that. But I don't know what goes on behind the scenes, and I can accept that.