Note to all: It’s time to begin exploring and discussing Jean’s potential as a telepath and telekinetic—two of the most versatile powers around—and how she can wield them in ingenious and unexpected ways. I need everyone’s help on this!
So, she can influence and possibly control animals. After soulsword323 shared the page above, I was reminded of that time she communicated with and enlisted the help of dolphins in the Classic X-Men backstory “Lifesigns”:
Incidentally:
“The powers [Hope Summers] copies are at their full capacity.” However, after mimicking Jean’s telekinesis, Hope is unable to overpower her or penetrate her telekinetic defenses.
“Hope, dear, this isn’t a battle you want to fight. You can’t beat me with my own powers.”
They're not gonna base the future of the MCU on a child from an alternate timeline of the Fox Movies. Fox characters may return in cameos but they'll reboot. Deadpool will likely only stay the same because with his 4th wall breaking he can just join the MCU while acknowledging the meta logistics of the situation + he's not that connected to the X-Men anyway.
If the MCU introduce anyone else as Phoenix but Jean, I’m going to have five strokes and an aneurysm.
Also, it was rumored that Josh Brolin will return as Cable. Isn’t he known for traveling to alternate timelines? They also made a character from the Sony films into 616 Spider-Man’s greatest enemy.
I don't think they're gonna be focused on the multiverse forever. It's the main focus now because it's new and they're just starting to explore it. But I think that, like in the comics you can be doing a bunch of AU stuff sometimes/on the side but the main universe needs to stand on its own.
There are many ways they can go about it in regards to Deadpool. He could bring his cast too. He could have his movies in his own universe but hop to the main MCU in other movies.
And regardless of that my main point is: Hope is not a relevant enough character for Marvel to want her as one of the first X-Men. She was created for a plot that the MCU isn't gonna be doing any time soon (Decimation).