He was close to being offloaded.
Pretty much everybody involved with McCarthy at a professional level says he has all the ability to improve as an attacking force. I'm curious what it is you've seen that make you think Roy Keane, Martinez etc. are wrong ?
I've seen that vision, finding space in the box and composure are very, very difficult to coach and quite instinctive.
If they where all infintely coachable then every player would have the potential to be great. That isn't the case.
McCarthy has shown he's very coachable by reaching close to the top of his profession but it'll need more than that to develop the next side of his game.
He doesn't play as the defensive midfielder he roams all over the pitch. You need an attacking aspect of your game to do that. 0 goals and 1 or 2 assists isn't the best in that regard. I think we'll see the best of him in front of the back four as Jamo says.
He's 23 and got a lot of experience. So he's not young and his game hasn't really changed too much since he came into the top flight.
That's why I don't see him developing too much further. He's still a good player like.