Perk is my favorite Celtic, but I think 10 and 10 is likely his ceiling. It is true that there is still growth potential -- he works hard and he'll get smarter with experience and perhaps more skilled in the post. But, I've been trying to come up with a highly effective offensive big man who didn't show evidence of offensive prowess by age 24 (Perk is not showing high level offensive skill to date). Perk is improved but clearly limited in his offensive game. He will get better, but likely 2-3 points better -- not 10 points better (as in replacing KG's numbers).
I'm often wrong, so I may be wrong here, but I'd be interested in hearing your thoughts about other 24 year olds who transformed from where Perk is now to offensive juggernauts by age 30.