Hrmmm probably it may be like that after this.Here's the fundamental problem...
Strength doesn't matter here. Black Zetsu got the shot to the heart. Unlike Obito, Madara has a normal human heart. He just has a little Hashirama on the outside.
No, he'll be taken over. Then, while he's being controlled, he'll think of his talks with Hashirama, and then regain control or play a role in stunning the body for enough time. Allowing the good guys to win.
He's become Obito 2.0. So I mean, he's bound to use a sudden mental image to stop being torn apart in his mind.
What do you mean by normal or not normal heart?