So at the end he destroys all his suits and gets his heart thing removed.
So, would you still call him Iron Man? He's pretty much just a normal guy again.
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Interestingly, I don't think the core he had in him was powering the suit because he kept losing power in the suit. For developing something that possessed so much energy, you'd think his core thingy could power the suit for longer periods of time. I think his suits were running on a different power source.