But at the same time, the alternate Galactus in Black Celestial arc was consuming the universe, and as such consuming Eternity/Infinity.
And it's been stated before that 616 Galactus is the first and most powerful Galactus.
But meh, can't really judge as we've never seen Galactus at FP.
I think we have seen Galactus at full power aka Well Feed Galactus that him at his most powerful imo.
Look at the Infinity Gauntlet it was Living Tribunal The IG wearer and Eternity in council while beings like Galactus the Celestials etc etc were altogether.
But how do you define their power level if they do not display it. I mean don't get me wrong I like the Celestials alot and from what I seen and read of them vs Earth Gods they seem vastly powerful I would like to see them battle people in their power range.
Have Kubik's statement, saw a fraction of Arishem's power, Exitar had the power to exterminate the entire Watcher race, according to Tiamut...they cannot be destroyed...Tiamut = Fulcrum...whoever he is