I agree with the comments above. So much talk about him being unhappy, wanting to transfer, ect. But at the end of the day it was all talk. This kid has worked his butt off, represented Duke with the upmost class, and deserves to have the captains title and his time to shine this year.
I think he was unhappy. I also think he took honest stock of the situation, as well as applying some realpolitik thinking.
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He was unhappy because he hadn't been successful as a player. Part of that was bad luck wrt injuries, but part of that was because of his own level of play, hustle, expectations, etc.
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And he was realistic. First, he realized what he needed to work on. He moved his feet every well on D down the stretch, and I think it has dawned on him that guys like Carter and Horford might be better targets than Oak or Anthony Davis (for different reasons). And he seems to be putting in the effort to play the way he needs to play for us, and him, to be successful.
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From a more pessimistic POV, I think he cynically realized that leaving would have been foolish. First, the NBA didn't want him. So that was a non-starter. Next? Transfer is dicey. Transfers down often have the stink of failure about them, as though they couldn't hack it in a tougher situation. When a guy like Hood goes "up" it is one thing. But going down is dicey. Further, a transfer would mean a year not playing. Even further, he had to realize the situation is ideal for him next year at Duke. We'll play a 3.5 out and 1.5 in (Zion being a weird hybrid of outside and inside). We need him to be the anchor on D and to rebound. If Ques does well in that role, he'll be off the board by the mid 20s next year.