I watched both of the Avs games since the trade, closely focusing on Necas. I have mixed feelings about the fit... but overall, Necas has impressed me. The Avs -- especially MacKinnon -- are going to have to make some adjustments while test-driving Necas. But he's such a cerebral player, that he'll be the one to lessen the learning curve for them, imho.
In the first game, he and MacKinnon were feeling each other out and over-passed quite a bit. Necas also traveled to areas where he wasn't expected, especially on the PP cycle... all of this will get worked out in practice.
Imho, for this to work perfectly, Nate Dog is going to need to be willing to increase his shooting % by........ a lot! Rantanen has a mammoth shot and likes to wire it. MacK. will need to take on that role, which Necas to a lesser extent. On the PP, I think Makar will end up shooting even more. That said, I wouldn't be surprised to see the Avs try to land a sniper at the deadline or before... someone like Boeser (but not him per se).