Hence why I said this chapter. And I'm not saying it proves or disproves anything except that we know Kaido is mortal because he thinks he is.That neither proves or disproves whether or not he is immortal so it's useless to even bring up him being crazy which we don't know yet what he was refering to. Translation errors happen all the time, even if it's not I'll wait untill I have confirmation that he thinks Whitebeard is alive. Untill then you are dismissed.