"so obito was godlike even without rikudo powers"=He is certainily not
"due to kamui he was able to went through the dimensions to control his rest chakra"=Loigcally he can't use his eyes nor your will of god kamui since his soul is just a mere representation of his physical self(if you are saying is what kishi doing it will create a lot of plot holes everywhere in the entire manga)
Rememer minato sealed his chakra and kushiana's inside naruto along with kyubi for meeting him later
Well judging from your avatar you seems like a kakashi fan so i can understand your feelings but kishi went overboard with him and made other uchiha genius's like itachi and madara look like fodders.
Moreover how can kakashi bring out perfect susanoo in that worn out state.He didn't had EMS Neither half the Chakra Required
That's why i say's that kakahi's huge powerup was to end unhappy kakashi fans like you who got sad when kakashi lost sharingan and turned to his original self.
but Seriously he could have given him powerup(or sharingan) in more appropriete manner
Kamui is godlike, but that is an other topic.
you don't get that there are ways even in death you can manifest yourself and still take influence on the living world.
Rikudo did this ( because of the 3 eye i think), Dan and Tobirama had ghost jutsus which allowed them to move between live and death still influencing the material world.
Madara was able to control his soul after edo tense was canceled by itachi, btw that was really an asspull, cause it was never explained why madara was able to do this, he hadn't got a s/t ninjutsu.
But obito has, its not called s/t ninjutsu for nothing! he can travel through space and time.
kakashi was worn out, but obitos chakra backed him up !
Madara is no fodder and itachi had even less stamina than kakashi, who now possesses the chakra of obito, an uchiha, too.
From your ava i can see you are sasuke fan, would you be sad if sasuke lose the rikudo power up after the war ? Which is also an asspull!