Personally, I would be very surprised if Cole improved his skills any after his loss to the MC, because that would mean he was still a person, capable of learning and growing as a result of choices he made. I can't believe that Tanos is just going to fix him up. That "I'll fix every last thing wrong with you" as he grins at a helpless Cole does not come across as a sincere promise to help. Nah, if Cole ever does come back, he's coming back as components of a chimera. Not really him anymore, just him giving one of Tanos' creations some firepower.