I've said this in the game thread but I think it is appropriate to mention this here as well.
I think one of the important factors that make T-Mo so much better with us than Denver is that he already played under coach Blatt in the Russian national team.
From Blatt's perspective, he knows him well, knows his strong and weak spots, knows his personality and how to utilize him well on both sides of the court. And we can clearly see that basically Moz has been very effective for us from almost day 1.
From Mozgov's perspective, after quite a weak stint with Denver he gets to a coach that already knows him, and he knows he doesn't have to prove himself again and all that. He knows and trusts Blatt so getting into this familiar setting, knowing the coach has your back and just wants you to play your natural game has a great psychological effect, especially on a foreign player. And this also can be seen in T-Mo's game. He's not forcing plays, he's not doing things he knows are out of his element, he plays calmly and his natural game, knowing that Blatt trusts him.
I believe small things like that have a huge impact and one of the reasons T-Mo had a hard time in Denver but fits our team like a glove (beyond the obvious tactical reasons).