Zeref uses dark magic, and Romeo uses fire magic. Not saying he could turn into Zeref, but it's not likely at this point. For this to be real, it would mean Romeo ends up back in time and is unable to die. This means he knows the future, and the Zeref on Tenroujima would know what would happen. Clearly, he doesn't.
No, my guess is that Natsu somehow ends up back in time and befriends a young Zeref. And somehow a promise is made that, if Zeref really does turn bad, that Natsu will stop him in the future.
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