I don’t think a team could stash a completely healthy player against their will. The player could prove they are healthy with a physical.
Also with IR the player does have to make the roster first. So we’d have to keep Reyes, then IR them, then sign back a replacement.
Correct, he wouldn’t be able to practice on IR. But it would be a way of keeping him through to next offseason.
If he’s actually perfectly healthy, they probably aren’t going to try to IR him. Either he’s close enough to ready to make the team, or he’s not and you try to place him on the practice squad and bring him up later in the season if he shows improvement.