Easily masked man he was prepared Kakahi wasn’t prepared and as soon as he go towards him he can just suck him in kamui the only reason minato was escaping kamui was because he had ftg only reason otherwise obito would have sucked minato in kamui dimension and let him die
Madara's training had reached Kage level in a few months, Obito. He could also use MS. At the age of 14, he took control of the yagura and managed the kirigakure. Obito would have won.
Kakashi probably would be immediately trapped in the Kamui dimension since he doesn't have FTG to escape it like Minato. Nor has he Kamui of his own because he didn't learn it at that point in time.