I understand your point. What concerns me is taking a guy like Deejay and moving him around hasn't worked out so great for the player long term. Starting him out as say a slot receiver, moving him to RB and then back to receiver is not ideal for him or for the team. Maybe it would work out, but history proves otherwise.
Deejay was recruited with the idea of being a utility man who wanted to play both offense and defense. I'm not saying to start him out as the 5th team RB. I'm saying play him wherever you originally planned to play him. But if we lose our top 2 or 3 RBs move Deejay to RB on an emergency basis. He's a very smart kid who can pick things up quickly enough.
I see no benefit in wasting another spot on another JAG to be a 5th string RB. The odds of making it all the way to your 5th RB are astronomical and don't justify signing a guy like this.