For me, everybody there can leave. This mercato will demonstrate whether GM is actually able to clear out legitimate 'dead wood'.
I would also be inclined to give Martinez a second chance, considering, as a matter of principle, I generally think it's REALLY unwise to sell a player after one season (at a loss, after a significant expenditure) - especially given his issues with injuries, team disfunction, and the fact that it's possible we'll have a new coach/system next year. If we were going to be consistently playing a 4-3-3, he might be able to provide some useful squad depth.
Of course, if we were to get an offer for Jorge close to what we paid for him, I'd sell him in a second. But that's not going to happen.