Personally, I think that there is a good chance that Rodney holds on to the job. I would definitely hold on to him even after Jones is activated. Jones will probably be given a chance to reclaim the role, but aging relief pitchers coming off of injuries during the season do not typically perform well, and I don't expect Jones (who I never thought was that dominating a pitcher to begin with) to be an exception to the rule. Rodney may have looked shaky in his last outing but look at his statistics so far. Granted it is a small sample-size, but I think he brings more to the table right now than Jones, and as a young, emerging pitcher, he has room for growth. Personally, if I were Leyland, I wouldn't mess with the closer position because "if it ain't broke, then why fix it?"
"I have great faith in fools; self-confidence my friends call it." ~Edgar Allen Poe