What's the list of players who have transferred out of Purdue and been significantly better on the P5 level to the point where you can say Painter misused them?
I do think Colvin has the chance to take a big jump forward statistically on a new team and appear to be that guy. Give him shots and I think he can be a big scorer. In 2 years, we might really miss him. However, if I had to bet, I'd take my chances that Purdue has a better ORtg than the team that ends up with Colvin next year. That's not a knock on Myles; it's just the reality of how efficient you need to be to be featured among the group Purdue currently has.
I agree with Rosie's post: Myles might be able to find more individual success elsewhere, but Purdue should be just fine without him as well.