The Sumera-mikoto and Nigi-haya-hi-no-mikoto

There is another possibility that Nigi-haya-hi-no-mikoto should have been Ni-nigi-no-mikoto himself or one of his offspring after some generations. For both of their names included a common part, nigi. If this hypothesis be probable enough, the first Sumera-mikoto must have been a distant relative of Nigi-haya-hi-no-mikoto, whether direct or collateral line.