About the "weakest" controversy:
- In-story: it's Scott who is thinking that. He doesn't only think in terms of raw power, but also experience as a combatant. Jean was the last one to join the team. As much as she had both the raw power and the control over her abilities, as a combatant, she was the newbie of the team when she joined. I don't think it was meant to be disparaging (source: my brain, which is weird like his). It was just a fact. Something that expressed his amazement at how much she had improved in every way.
- Outside the story: I agree with Mercury. It's just CC's way to highlight how powerful Phoenix is.
But moving on before I regret having written this...
@Mercury: here is another Jean-Ro hug for the collection. It happens on the background of the scene, but Jean looks happy to meet her sis again, doesn't she? Such a heartfelt hug. <3