He needs to get truly healthy, then get his instincts back. Without that, he's certainly worse than the guys currently starting. Worse than Bobby O who joined the Giants. He's not worth the contract given.
With all that said, I'd argue that as long as he's healthy, the only way the instincts come back is by playing.
It stinks for him but this is football, it doesn't stop for anyone. Not Luck, not Peyton, and certainly not Shaq.