Define, please. Poor and really good are exceptionally vague terms.
He is without a doubt. But that doesn't mean that he's an NBA first rounder or even a 2nd rounder. He plays a lot of minutes and gets to take lots of shots. He makes quite a few of them, too. I don't think Tyus is athletic enough to overcome his shortcomings as a scoring guard, despite his NBA size. Ultimately, I think he's a slightly undersized 3. And he's still crazy athletic compared to the rest of us schlubs.
I posted his stats earlier in this thread. From last year (being the 4th option on a very good shooting team) to this year (being the first option), his percentages are nearly identical, which is a credit to him, but I think being the focus of the defense is being overblown here.
I think that college players should go pro whenever they can. If Tyus wants to get paid to play basketball, I don't really care, good for him, but I don't see him as a first round pick. I also don't think he gets much better with another year. He is what he is. This also speaks to your fringe 50-60 players. Syracuse gets a lot of 'tweeners as recruits. Though I don't think very many front offices commit the resources of a draft pick based on a handful of minutes or a game or two.
I do think looking at the total of mock drafts is a good thing. I don't get too worked up over pick-by-pick predictions, but they're obviously made up of tiers and I generally trust the conventional wisdom aspect of them (e.g., if a guy isn't showing up in any of them, there is a reason).
Responding to the thread starter as to whether he's gone or not, that's only something that Tyus can answer, but based on posts from various insiders, it looks like he's made up his mind. So ...