I don't care if Rumi is a red herring or not i just care about numbers!
2 of 3 now 1 more new character to go and we can say that RUM has already appeared
Being a red herring doesn't deny she IS a Rum candidate,just like Subaru was a strong red herring but still a candidate to be Bourbon.
I'm just comparing Rum's arc to Bourbon's,we had 3 candidates too (I'm not saying Gosho is going to repeat himself,at the end have 3 candidates and NONE of them is the real RUM,which means the theory that RUM is an old character is still valid)