OBITO's kamui has been proven a jutsu to send or bring back objects into another dimension. Peoples are alive in that dimension. ITS just a normal place but just another place like alternative universe.
Now what makes OBITO's Kamui useless aginst Minato is that Minato is also a space time Ninjutsu user. so even if OBITO traps minato in his kamui , minato still can come back to real world just by teleporting his whole body to a kunai in earth. Minato's space time ninjutsu allows him to move through space and Time loophole and appear anywhere in universe. ITS a fact that during minato vs tobi fight , tobi was able to suck few body part of minato but minato dematerialzed his whole body and teleported to another kunai.
so if minato couldnt travel out of obito's dimension then shouldnt his body parts be disected from his body just like Deidara lost his arms agaisnt kakashi's kamui.
so it proves Kamui is useless against minato.
Now what makes OBITO's Kamui useless aginst Minato is that Minato is also a space time Ninjutsu user. so even if OBITO traps minato in his kamui , minato still can come back to real world just by teleporting his whole body to a kunai in earth. Minato's space time ninjutsu allows him to move through space and Time loophole and appear anywhere in universe. ITS a fact that during minato vs tobi fight , tobi was able to suck few body part of minato but minato dematerialzed his whole body and teleported to another kunai.
so if minato couldnt travel out of obito's dimension then shouldnt his body parts be disected from his body just like Deidara lost his arms agaisnt kakashi's kamui.
so it proves Kamui is useless against minato.