I remembered that I actually sent a question over to the edit staff at marvel.
I asked,
I was confused by what the character called the Watcher said in the beginning of the issue #137. "Jean had become one with a primal force second only to that of the creator." Exactly who is this creator in which the Watcher speaks of and is Jean as Phoenix actually this powerful?

Here's Nick Lowes reply
That is a mystery, Michael. It’s partially up to your interpretation.
But, yes, the Phoenix is REALLY powerful. Planet destroying, etc… It’s probably more powerful than Galactus.

So I was thinking, maybe this is why they waited so long to bring her back, because she was too powerful like Galactus since he isn't in every FF comic. But then again this was pre AvsX.
I also know this is pre Chaos and confusion of the Jean Grey/Phoenix Force imposter, but I was just wandering what Phoenix's limits were since everyone on fourms were taking pop shots at her and saying she wasn't that strong, this and that. Thor, Hulk, Magneto, Galactus, ect. could beat her. Now with the AvsX, it's been answering questions of who would win Thor or Phoenix. Well, the Phoenix Force anyways.