Ok, so I went back to base to switch companions, and Arcade Gannon won't join me anymore.
Earlier in the game what happened though was Arcade ran up to me at the docks when I was coming back from talking to Caesar, (when he was supposed to be at base) and said something. Then I thought he glitched, so I asked him to join and then sent him back to the lucky 38.
Hours later...
He won't join me anymore, there is no option to get him to join when I have no partner, but when i DO have a partner in my party, he says my party is too big.
This svcks, I want to do his side quest and I can't even get him to join.

Yeah I have this problem and so does other people. I seen people with this problem on the 360 too so I think it may be a scripting problem. I've got no solutions though. Does anyone know the PC console command to force a companion to be a follower?