It wasn't that astounding, based on potential. His wingspan is absurd for a two-guard, and he has all the elements (deep range, spot up ability, floater, length to finish at rim) to be a versatile scorer, though more likely as a complementary piece than a go-to guy. In addition to some UConn highlights, he also dropped 35 on Lithuania in the U19 Championships, which turned a lot of heads.
I thought he might go 7-10 based on potential, but also wasn't surprised he slipped (past 15 would have surprised me). He certainly does have some holes in his game too (skinny, lack of lateral quickness/explosive first step, a bit of a loose handle). OKC was a bad place to be for year one, and now a great place to be for year two (for now at least - that could depend on personnel moves between now and the start of the season).