It seems like the Niners Brass wants him on this team somehow, some way. The discus skills may be able to translate into a really strong/fast spin move (a la Dwight Freeney in his prime). Now, there's a lot of work to do, but it seems like there's just too much raw ability for him not to make the 53.
My concern is his hands don't seem to be violent (from the few clips I've seen). But, there's only so much he can improve each day. Obviously, he's got a LONG way to go, but it's exciting to think what he could potentially be, if he pans out.
Now, some have thought about him at OT or FB. I see FB making a lot of sense from the rugby background, but OT requires a lot of technique and time to develop. But at 6'6" 305 lbs, he's just too perfect to be a 3-4 penetrating DE.
But, he should be on 53. I don't want to see another team develop him.