First of their needs to be a legit theory for him to be corrupted. Story wise i don't think it's possible. Chief may have lost cortana but i don't believe he's at such a low point that he will completely change who he is. Johns not crazy YET! If they did make him evil, then their writing team better be godly.
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1) You're taking this seriously 2) Being a Didact does not mean you are evil
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Oh i assumed you were pushing a legit theory, nvm.