Everyone who thinks Kuroda is Rum needs to remember Gosho's classic pattern
Suspicious: Jodie Starling, Akai, James Black, Kir, Eisuke, Camel, Okiya --> Not the bad guy
Nice Person: Araide, Amuro Tohru --> The bad guy
I'm not saying Kuroda can't be Rum, but Gosho does do some of the same things over and over again which should be kept in mind.