It would be nice to know what he's been working on.
He's sort of a tweener. A bit too short and under-powered to be a PF, not quick enough to be a SF. Good instincts, and moves pretty well.
Assuming he hasn't gotten any taller, he could either have tried to bulk up in the off-season to be more fit at PF, or tried to slim down to help his quickness at SF.
I'm assuming he worked on bulking up. Plus skills, of course.
With more experience under his belt and a more muscular build, he should be a no-cringe sub for 4-5 minutes each half.
He has promising passing chops and the potential to be a decent shooter - although we didn't see much of that. So if he worked on those skills, he might even earn more minutes.
We would like to be able to count on Luke picking up the minutes and scoring provided last season by himself and Joel James. That's actually closer to 13 minutes (although that's somewhat misleading to the high side since neither player played in all games). Together they averaged 3.4 points and 4.0 rebounds. He needs to be more efficient than that.
The biggest uncertainty we face with our front line is not knowing how many minutes our guys can play. Can Isaiah stay out of foul trouble? Can Kennedy stay healthy? Will Tony be ready for long minutes at this level of competition? Those are the guys we want on the floor the most.
The good news is that if we need Luke to play more minutes, he looks like he could handle it. The bad news is that if we do need Luke to play more minutes, we're probably in trouble.