Well...I doubt very much that anyone else in the Company would allow Gorgon to actually join them. He doesn't work and play well with others. Even if he 'saw the light' and renounced his evil ways, Nelwyn, for one, would never trust him. Without Nelwyn on board, there's no Galador on board. Gaelen, of course, loathes Gorgon to her very core anyway. He'd have to do some AWFULLY convincing 'mea culpas' to ever be allowed to join them. I doubt Fima or Orogond are capable of forgiving him, either. They might make a real effort, but they'd never trust him.
IF allowed to join, whether he was in charge of a given adventure would depend on its nature. If, for example, the plot was to infiltrate Tur Dorcha (a rather foolhardy idea), Gorgon is the only one who knows the inner workings, and he would be a natural 'first chair'.