The roster is at 90 because it's full of place holders to run mindless drills for a few months and get released. There are usually 25 or 30 players of that 90 who really have very little shot at making the roster. With that in mind, I don't see how it would be a problem to bring in a guy with talent (however rusty he might be, at this point) for a look, at the expense of one player who was likely never going to get a serious chance in the first place.

I don't know why it's necessary to make such low risk, tryout-type deals seem like a game of Russian Roulette. We're not talking about drafting a guy, or signing him to a mega deal. I'd kick the tires for the vet minimum.