There was an inevitability that Rooney would return and he came back with a point to prove and I personally think we could have gotten another season out of him had we managed his aging legs better. He didn't have the engine he once had but he could still score a screamer and he gave a crap.
Ross isn't a Rooney, he doesn't have his mentality. I don't think for a second Ross would come back looking for redemption, desperate to show Chelsea what they'd lost and to win back Evertonians. He'd just coast it and collect a wage, Have the occasional good game but that's it.