Kizaru is above Law and Kid. By that logic Luffy would prove himself superior.
Where did I say kizaru is below Law and Kid?
Kid and law didn't push Shanks and Teach to high diff
Current Luffy beating Kizaru only proves Shanks, Teach, Yonko could always do it (easie than Luffy whould ) since they're all skyplitters (meaning on the same level)
Teach even has an admiral under him. So yeah Yonko > Admiral has been a fact since
The gap may be slim or small