The good news is that you have enough rebounding for this season. Next year, when he's a junior, you'll have 3 solid rebounders. In two seasons from now, he'll be your lone senior. This is why I'm not a big fan of the SF, they typically aren't strong in any one category at D-2 and D-3.
I don't know the answer, but have a feeling whatever you decide, it probably won't have that much of an impact. It mostly depends on what kind of team you want over the next few seasons. In terms of positioning, I don't think he could ever play PF. Even if you got his rebounding up a bit, his athleticism is on the low side. Now you might want to make him a decent rebounding SF, but putting him at PF should be out of the question.