Use their logic against them and tell them that Sanji is way above Sengoku who didn' tdo much to Ballon luffy who is above Rayleigh and they are gonna cope and cry
But basically, these guys way of thinking works like:
Zoro didn't see the Gorosei = It means he would low diff the Gorosei (which never happened)
Zoro didn't see the Seraphim = He one shots the Seraphim since he knows how they work (also never happened)
Zoro didn't fight Kizaru = Kizaru would be one shot
The problem is they trully believe that, so they think if Zoro was put in a similar scenario like Sanji, Luffy wouldn't be able to transfer that to Mars, because Woronoa Woro, the grandmaster, is him or something, so Luffy would die or simply refuse to ask Zoro's help knowing that he would die by Zoro's weakest move.