I would say clean and disinfect for now, it needs to stop bleeding firstly... then come tell us how THAT looks and how he is doing and see from there. I have no experience with antibiotics with my chickens, so someone else can reveal more than me, but I'm not clear on any negative affects... it was after all a feral coon.... dangerous possibilities it has had access to....
hmmmmm....... Me thinks they are giving a thumbs down to the roosting area. Either that or they just need more time to adjust.