If Lewis takes out Werdum he's more legit than Ngannou and Volkov. Ngannou's best win is a way past his prime Arlovski who has the chin of a FLW, and Volkov has only beat Nelson and Struve. Werdum is in a different tier than modern Arlovski, Struve, and Nelson.
But, no, I'd reckon Overeem and Ngannou deserve it more since Lewis will only be on a one fight win streak since losing to Hunt via gassing from eating a giant meal right before the fight.