Yeah, running backs can walk in and play. It's plug and play. Always has been, that's part of the reason they are so replaceable. The drop off from JT to Moss is big....no doubt, but not like the drop from starting.....any other position to the backup. He k, street FA can come in and be serviceable RB in a couple days. JT could practice once or twice and play on Sun. Just fine, assuming he's actually been conditioning and healthy this whole time. (Hint, he has)