Because the Phoenix copied Jean Greys body and took a chunk of her actual soul. That is what the cacoon story and that classic X-Men story said. It then returned it's experiences and memories to Madeylne who returned it to Jean. When Jean Grey goes Dark Phoenix and she's not talking like her normal self. She's consumed, not a host but a shell. Just like how Emma was, just like how Celeste was.
Also from my reading of Endsong...my theory is when the Phoenix is consuming it's vessel that voice is fake Jeans. Because it copied her brain patterns and emotions when it replicated her. So effectively Emma in Endsong is being possessed by fake Jean Grey. So when Jean in Endsong is consumed she's possessed by fake Jean from Phoenix Rising.
Warsong...weakens the argument a bit because that voice talking to Celeste didn't show a lot of Jeanisms.



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