I think that draft day trades like this one are tougher than they look like on the surface. Turner might be mentally out of San Diego already. He and his agent have been remarkably silent on this. If San Diego does not do a deal on draft day. It will cost him multiple millions in contract value. His Trade value and contract value are never going to be higher than prior to draft day.
A draft day trade leaves no time to negotiate a contract with Turner and no one is going to trade for him and then try to sign him. Any deal has to be done before draft day so that a contract can be in place. If not in the next week or two then a deal is not going to happen.
Any value that he has to San Diego during a superbowl run might be negated by the bitterness he would have about losing millions of dollars.