Not caring =/= strengthening your will and making a decision. Not caring is pretty much the exact opposite of that, actually.You forget that he didn’t care what he was when transformed, that means he made a choice. The partial demon transformation was in complete, that’s why. Being a full demon would have destroyed the seed anyway. Plus END can counter DH by his flames with the power of emotions. Heat till time is distorted and then kill Zeref. Invel states that END is a threat to Zeref, read again, and Zeref express confidence by congraduating that they almost resurrected END. Again, Zeref contradicts, you are stretching there
END's flames are not powerful enough to burn time itself and overpower Fairy Heart. It didn't burn Dimaria's time magic, and it couldn't overpower Erza's bare hands. You need to imagine END has powers it never showed in order to justify him beating Zeref.
Invel said that END was a hindrance to Zeref, not a threat. Invel later went on to expressed confidently that he could deal with END. Zeref complimenting Mard Geer on almost resurrecting END is not the same as Zeref expressing confidence in END's ability to kill him. One does not imply the other. He's just saying "nice try" to Mard Geer. There is still no contradiction in anything Zeref ever said regarding wanting Natsu being the one to face him. He still believed that Natsu would chose to destroy END and wished that Natsu was the one to face him. The only contradiction Zeref had regarding Natsu is whether he wants still Natsu to kill him or to abandon suicide and just destroy the whole world. Zeref has stated multiple times that he believed Natsu would be strong enough to kill him. More important than his words, however, is Zeref's actual plan. Zeref planned for Natsu to be trained by Igneel to become strong enough to kill him. He didn't just try to unlock Natsu's demon powers. Zeref never once stated that he believes END's demonic power can kill him. Not once in all 526 chapters. The only time Zeref actually believed someone had the power to kill him was when Natsu came at him with Igneel's power.
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