obito's kamui + rinnegan...!
i was gonna say double MS but we don't know full power of kamui like what can it do against ftg user or against defences like susano...! i know kakashi's kamui can warp susano but if the opponent is sensor then what???
obito's kamui + rinnegan has no weakness as kamui allows him to remain intangible and rinnegan techs can easily kill opponents...! as rinnegan can absorb any ninjutsu in case kamui fails to protect and has quite devestating powers...! also having two kamuis kinda make it useless since technically both do the same thing....!