Zen No you didn't mention race but several others have .
you can always count on race being mentioned when either Tubby is discussed, or Kentucky players vs non-Kentucky players are discussed. FWIW, I don't think Cal looks at players in terms of their skin tones, but how good of athletes they are.
Anyway - I love Derek Willis, as I love all our players - and want and hope for the best for him. But no, he wouldn't start most major conference teams (I say most because there are a few who are exceptions to the rule) because of his lack of defensive skill.
Yes, DW is a good passer, yes he can rebound some, yes he can hit threes and he IS good at the line. Sometimes he makes spectacular plays. But he also loses rebounds easily, loses his man easily, and does not defend the perimeter well at all. HIs biggest value, right now, IMO, is that while he can cost points due to lack of defense, he can also shoot so earns points as well. It becomes a wash - neither helps nor hurts, but can help maintain a score while another big gets a rest. Plus, he adds five more fouls.
DW did really well against the mid-majors we played, because his skill level is commensurate with theirs - but with better training. He doesn't do as well against better athletes. It is what it is.
Just my opinion.