The Jerry Rice doesn't look right to me. Atypical. I'm not sure it's real. He has a nice signature and that example isn't one I'd want in my collection, even if I was certain it was the real deal. The other two I'm not sure on. But the rice I'd be highly suspect.
The Montana looks consistent with his style, Rice does look a little iffy. O.J. not 100% positive based on sig (does look pretty good), but the apostrophe after 73 is the way he writes his inscriptions. He does that mark after the 5 in his HOF 85' and I don't think a forger would pay enough attention to something that (seemingly) trivial.