He's too old to learn intricacies of the game imo, you can just chuck a guy in at RB and expect him to be able to read blocks, read defenses, and be able to absorb and learn a play book when he's never played a down
Maybe WR, he has fluid hips but he's never run a route before, and he's going to be such a raw route runner, that even if he is athletically gifted, he's not more gifted than most corners, even 3rd or 4th string, any corner worth their salt will be able to read his hips, read his movements and stick with him and make plays on the ball.
He could make it as a kick return specialist, but no NFL team rosters KR/PR Specialists unless they offer you something else. He is athletically special, so he'd be signed by a team but he would need to spend 12 months, probably 24 on a practise squad learning the game. So he's going to be 28 before he can even make a roster IMO.
This is a bad idea. If he was going to do it, he should have done it 5 years ago
Ill be following with interest though