Vitamin_F
personally i think Obito will kill him in a 1vs1 fight, but i think she can defeat Obito if she manages to enter kamui space, then she can destroy it and weaken Obito (but she will still be against a ninja who And at the Kage level that Madara had to train so in this situation the fight will be extremely difficult for her even without kamui đđđ)
Ofc shiki will win, everything that have concept of death can be slash and killed by shiki. Obito kamui is strong yes but obito himself is still mortal (even immortal can be killed by shiki), obito using kamui is just like a ghost cannot be touch intangible, but even his kamui cannot hide his own line of death.. so the moment shiki cut his line of death, itâs the end for obito~