I don't think it would hurt. The guy was active in the few minutes he was in there. What is strange is he is 6'11" and it looks like he can play, but how come he can't stick with a team?
It wouldn't be too surprising if some issue surfaces with Jones that explains why he hasn't stuck but it also wouldn't surprise me if its simply that he hasn't been in the right place at the right time - or maybe he has been improving slowly and we're seeing a better or more motivated player than past coaches & GMs did.
One thing that we tend to overlook is that there is a rather fuzzy line separating the guys that are good enough to make a roster and those that are not - statistics alone tells us that is to be expected. That means there are going to be mistakes made fairly often. Heck, the decision makers have lots of things to think about that are more important than whether marginal player A is better than marginal player B, so you shouldn't expect too much accuracy. Very likely, one thing they do consider is whether or how often a player has failed to make a roster in the past so every failure adds to hill the guy has to climb to make one.
Luckily, for Dwayne Jones he's found a team that is in desperate need of what he does best so he figures to get a fair trial. From the little bit I've seen of him, bringing him back for the summer leagues, at least, is a no-brainer.