The numbers that would be worth examining would be how many guys at a similar juco level in the past 20 or so seasons averaged 15+ rpg, and what those guys did after transferring to D1.
I think if someone has a nose for the ball, the rebound numbers will follow, and if he's got three years of eligibility as is rumored, it wouldn't shock me to see him get 10+ by his third year. Especially with all our misses. I think he grabs between 7 and 8 next season if he's here, since I think he's a lock to start.