This makes no sense. If WG is considering their alliance, they will also recognize Luffy as the lead of the alliance. At the same time, Kid, not being part of it, managed to achieve the same thing as the alliance (by the eyes of the WG). Which basically would mean Kid is on the same level with the alliance.
Conclusion: If they consider Luffy and Law as a pure alliance, they will consider Luffy as Lead and put only Luffy and Kid as new Emperors.