Don't know that I'd agree, but don't know that I wouldn't either.
My guess would be that what turned Mile off on Sam was a certain lack of, for want of a better word, "subtlety". Even Trane at his most torrential left you with layers. Sam was. like I said earlier, "in your face" even when he wasn't really trying to be. That's just how Sam was (and still is), and that's what makes him such a beautiful player. But Wayne was always had a quality of "in your mind", even when he was getting in your face. And that's what I think Miles was after for his band, that extra layer of impact.
Besides, that rhythm section was already pushing the limits even when George was in the band, and Miles did absolutely nothing but encourage them. No matter how much Tony dug Sam, you still had Herbie, who always brought a little bit of cerebiality to the plate, one that would fit better over the long haul w/Wayne than it did with Sam. Just my opinion.
I'm talking "personality" here, not "substance". Sam in those days was a very advanced player, so it's not a matter of Wayne being "deeper" or anything like that. We're just talking collective/cumulative/synergistic band personalty.