Fair is fair, I did not expect you to actually do it so kuddos. My only disagreements would be:
I would include Lamelo and Avidja in the overseas "non bust category". I feel like if you're not going to count the foreign players who played in college, you should count the non foreign players that played overseas....and Avidja is not a bust.
If you don't stop at 2015, the ratio changes significantly. For example, if you go back three more drafts I have those three drafts as 8/13 hits. This nearly doubles the percentage. So depending on where you arbitrarily end the sample things can be much different.