I don't. I think it's his improved vision (whether from better goggles or an improved comfort zone) and a return to NBA shape in addition to having a big guy play alongside of him that's made the difference. For the vision and conditioning, look at the lift in his legs and his ability to collect rebounds and handle slightly errant passes - areas that were sorely lacking in Nov/Dec IMO.
I think it was Amare's interest in money that helped him keep his mouth shut during the trading period. It's possible that his attention to detail on defense is financially motivated but I really believe a lot of that is growth also. Remember, most of his pro career has been for a coach that derided defense and I doubt any of his 6,000 high school coaches taught him much either.
I think if we re-sign him to a max/near max deal we're looking at roughly the player we can expect to see (injuries notwithstanding). Even if money has influenced him I can't see his ego putting up with the disdain he'd face if his improved play went away post-contract.
Steve
Amare has been consistent over his career in his behavior: He steps up his game when it counts most for the team, as long as his health permits. He had been bad at defensive fundamentals and unable to change it, for well known reasons. He could try harder but forcing on what you are not good at makes you even more injury prone, thus it's reasonable to reserve it for playoffs. It makes him appear to be shirking in regular season.
Somehow over this season, I said "blessing in disguise" due to his surgery-induced layoffs, he finally started to bend his knees a little more while moving on the court. With finally his conditioning back, this simple change in moving mechanics actually makes it a lot easier to keep his focus on defense, as well as giving him better chances at beating his man in one-on-one offensive sets. And this without huge concern for further injury!
Anyways, Amare is sometimes ridiculous even childish at craving for attention and recognition by others. But this trait is actually also guarantee that he genuinely want to win, to his best ability. If he appeared to be short of his promised improvement or so, it's because of inability not wills. As that Jazz tune says, "Blame it on his youth, Don't blame it on his heart"