Okay, but just imagine a Jean Grey trained by Emma Frost from the very beginning. Charles Xavier, who trained Jean the first time around, was the most powerful mind on the planet. And we all know how that ended. But imagine a Jean Grey trained by the most controlled mind on the planet. Imagine what she could become. Imagine the incredible heights she could achieve.
The All-New All-Different Marvel Universe needs to get Emma into the mix with a quickness, because Emma and Jean have so much to learn from each other, and we the readers have so much to learn from a relationship between them that is characterized by mutual support and respect rather than spite and resentment.