I think there may be legitimate reasons to not call him up soon…but worrying about how he fits or if he immediately makes them better don’t qualify, IMO.
This ain’t a pennant chase. Staggering toward the 6th and last seed in the postseason…with no real momentum…alongside no less than 6 other teams, isn’t anything. Maybe Jenkins gives you a spark and momentum, maybe he doesn’t. Does it really matter? At some point you chose to take the risk to move on from the comfortable, the familiar, the safe, the perpetually mediocre…to take a shot at something better than that.
Unless, of course, your roster includes a stupid and irrational mess of guys that can only play outfield, and calling Jenkins up only draws more attention to that fact. Then you wait until next year.