I understand Law and Kid need gather forces that are strong to rival the straw hats but for me it doesn’t make sense for her join someone else crew. If They didn’t do anything for her in the first place or she hasn’t shown interested them at all. That like saying Jean bart was free from Law he end up joining another crew instead law. Your reaction ends being the Pikachu reaction face. I’ve heard a theory from Brago that he believe some of warlord might End up joining some of the supernova Which would be interesting. Marco even says “do you think that pops’s voice is still binding us to will? Everyone else is free now”. Everyone Free-to follow there own path life once captain falls. I think it goes the same thing with some of the four emperors crew.
Im just really excited to see law and kid develop this arc