I don't think people here are giving Gamble enough credit. He isn't some unskilled Sean Rudder of a player. He is quick witted and as competitive as anyone. Hastings should be dropped before Gamble for sure.
I don't see why people think Cogger is going to suck. If he is only as good as Clune, that's great. Clune was a great half but was too small for the modern game. Cogger looks a solid defender and quick as well. He doesn't need to Joey it up, just straighten up the attack, get the ball to Ponga and Best in space, back up KPP sniffing for offloads and take on some of the kicking.
Either way, it's great to have solid options competing for spots.