Sure, but the two go hand in hand. You can't on the one hand ding him for not being the dynamic go-to guy when he had to play with James and Wade and then also dismiss his scoring efficiency because he plays with those two. Playing with other stars has benefits and drawbacks in terms of individual production.
I don't think Bosh meant he's become a worse player or a less talented one. I think he meant he changed his game to fit in Miami. He re-invented himself as a stretch power forward to work off James' and Wade's post-ups and drives.
If his numbers take a significant dive this year, I'll agree that he simply lost his Toronto era ability and he's not better than, or as good as, Aldridge. Right now, though, considering he's continued to play well, especially when the team has needed him to take a bigger role, my default is that he's still as talented as before, just playing differently for the good of the team. I think that's generally the league's view of him, too, since he still seems to be viewed as a max player (though that doesn't say anything as to whether he's better than Aldridge, since LMA would get a max deal on the free agent market too).