Petracca is coming from a long way back. He may not start running until close to Christmas. He's openly admitted that it's affected his mental state which is understandable and he's lost alot of physical conditioning. It's a big gamble to take on the remaining contract and the cost of the trade given the circumstances.
From speaking to someone close to him, physically he’ll be basically the same, it’s all mental at this point, and that no one will truly know till he runs out on the big stage and faces a crunching tackle.