“I actually once heard from a litveshe guy that the gr”a held that shlomo hamelech is moshiach…”
And the gabbai sheini at our shul says his nephew heard in the name of a chashuve rav that Moishe Rabeiniu is moishiach. On a serious note, I find it both humorous and a bit bizarre that anyone, including rabbonim from across the spectrum, purport to “know” who is moishiach or even speculate on his identity.