There's no difference to Lunarian genes and Germa genes. One gets trashed while another one is ridiculously more op. So King is THE definition of genes merchant because his LUNARIAN GENES were used to create the "strongest humans." Btw, you also clearly forgot that they're mixed with other genes as well, right?
Did Luffy complain about their abilities or their lunarian hax?
Fraudkuri's gimmick was his Future Sight in which, if it gets bypassed he became ass and fodder to Gear 4th and if he lost his calmness he gets ragdolled.