Galactus could one shot any of them. And could and has easily taken back the power cosmic from his heralds. And this is ignoring all the delicious energy being tossed around.
When Galactus fights heroes, it's always when he's hungry. Hell, we all remember when Thor took out hungry Galactus with a God Blast. Galactus who presumably fed on a planet tanked an enhanced Godblast, and planets getting thrown at him as well.
Kind of hard to see a team doing anything to stifle him.
If they don't stop at 4, they stop at 5. Dead.