I would love to say and believe that kid and law will each eventually be able to separately reach emperor level. Each being legit top tiers and having crews just as strong as the other emperors
At the same time what if they sadly can’t. We know and saw that right now that both crews are essentially fodder to actual emperors. So maybe the best option for them is to permanently team up. Maybe even beyond that they also get the rest of the supernova to join their alliance/crew.
Kid being the only conqueror of the group if he’s able to actually make it happen and lead them all it could be an immensely hype moment for him. All the supernova together would definitely be an extremely strong force able to give any crew a decent fight. It could be their way to compete with the emperors and get revenge. It’ll also give themselves a 2nd chance at going for the one piece.
