Well look, I'm probably the biggest Buddy apologist you'll find on this board, but I'd say 50-50. Last year as far as on-court production goes I'd agree it was more 80-20, but I can't blame Luke for Buddy shooting at such a low clip this year on some pretty good looks.
I do think I can blame Luke that we don't see Buddy getting easy points off backdoor cuts, or pulling up for more mid-range shots (I mean I doubt Buddy would be hesitant to take the midrange shots that he was taking all of last season if the coaches were actively encouraging him to do so; he might not be the highest bball IQ guy but it's a bit of a stretch to think that his response to coaches saying "take the open midrange that you took all last year!" is "BUDDY NO LIKE, TWO POINT ATTEMPT BAD"). Have to wonder how much of an issue fatigue is too.