I would certainly put McDermott, Payne, and Early in front of Napier. I'd also take Cory Jefferson first, but I recognize that few others seem to see him in the same light I do.
I'm in the same school of thought with McDermott as Gilles is, but I recognize that he has zone busting qualities that can't be ignored. Hopefully he doesn't go all Sczerzbiak on us and shrinks down his game into a Matt Bonner type three point shooting/hustling-rebound role. That's the vision that's probably the most snug fit for him and his team, and if that's the vision, there's a decided lack of upside that I can't get super excited about, but it's a role that I more than respect.
I'm torn on Payne; the eye test, I love the guy. Watch his progression over four years; the guy really improved his shot (didn't even have much three point range his first several years), and he's not the defensive hack he once was. I remember he really used to lack focus early on. And I think his defense is underrated, but that goes without saying for any dude coached by Izzo. I can easily see a Channing Frye like progression to his career--don't forget, Channing never jacked up threes much at Arizona either, and he's also a smart defender, also 4 years in college. Interesting, for sure. But with most four year players, you wonder--with the step up, is he going to deviate back to his formative, earlier play? With Payne I'm going to give him the benefit of the doubt and go with the eye test, because there's a lot of things I like that are translatable, and I buy into his progression. Eye test, certainly above Napier. My other test, not even close.
As for Early, my biggest issue with his position. I like his ability to finish and I can buy into his shooting progression, among other things, but I can't get past the lack of passing here. I'm thinking the halo of making it far in the tourney, as opposed to being totally legit at that point. I still see him as a 2nd round pick (mid 2nd rounder).
Jefferson was far more interesting to me last year than he was this year. What a bad stumble. My other test hates him--like dead last, out of 125 draft prospects. I just think he's so raw. I'm thinking Ian Mahinmi as the upside where maybe there's bits and pieces of some dunking, the occasional mid-range J and some shotblocks, but eh. He regressed this year.
Napier is far better as a spot-up scorer but I firmly believe he can be a PG in this league. He's also a really good rebounder by position. There's a lot to like here. The only problem is that he's seemingly slight of build, but the dude absorbs contact and draws fouls like no one's business, so it doesn't matter here. I'm convinced by both the eye and other test.