Redraft, Keeper or Dynasty format?
Redraft - If you are thinking of dropping Henderson you can pick up Crab's for a possible late season filler although as already commented on it is a long-shot but one I could definitely see IF you can afford to sit him.
Keeper - Don't know about the rest of your roster or how many you keep but if Crab's is a non-factor this year I could see your other WR's as potentially better keepers.
Dynasty - Definitely worth rostering and waiting on. My not have handled the signing well but the boy should still be able to become a solid WR and I would imagine the teams success improves the environment tremendously.