You don't seem to be getting my point. Yeah, 10 healthy players will suck but 1) Polley will be better by then and 2) position is just as important. The problem last year was that we had no depth at the 3/4 towards the end (and only 2 Cs).
We could have 12 scholarship players available but if they're all 6'1 our team is going to stink. Just because there are 13 scholarships doesn't make our team more or less likely to be affected by injury. Regardless of what happens at the 1-4, we have 3 or 4 guys who can play C ahead of Javonte. That's a much easier redshirt to make than, say, Richie was.
Let's say Jackson gets hurt. Whaley/Carlton/Richie aren't playing the 3. So how does having Javonte help us? Polley/Adams/Bouk are going to be soaking up those minutes, not Carlton/Whaley/Sanogo.
If he doesn't redshirt, it probably means he's much farther along than I expected, which could be fantastic for the team though. Depth never hurt anyone!