I agree. But I personally do not agree with the theory that everybody produces a Nobody, simply because there are far more Heartless than Nobodies. My guess as to how those people can come back to life is that just slaying the Heartless is enough for that to work here. So, Iif your heart is weaker, it's actually easier for you to come back. What happens to the body once the Heartless form, then? Who knows? We might get to know some more about that later. And if evereyody does indeed get a Nobody, why are there so few of them? What happens to the rest?