I imagine this AU to have a very bitter Romeo present during P's creation. He's helping Geppetto & gaining his trust, begrudgingly, as a bit of a double agent with Lea. Yet Romeo is always procrastinating on the moment he will FINALLY "stop this". He never does. He always has an excuse. But that doesn't smooth over the fury he feels every time he sees P. And he's not sure what makes him more angry, the fact that a replacement is being made for someone he loved or that the tiny details don't match. That there are areas where Geppetto felt the need to fix, improve, or just couldn't be bothered to remember correctly. It infuriates Romeo and yet no matter how righteously he dreams of himself breaking P so Carlo's integrity wouldn't be bastardized anymore he can't bring himself to commit to it. He misses him. This AU leans toward the idea that P&Carlo eventually are the same - for the love of the melodrama :)