This.

Though Hulk has no known upper limit to speak of, that is not his “default” state. Durable as “Savage Hulk” is (granted, that is VERY durable), he still doesn’t have the juice to deal with the ones sitting on top. He has to gradually get there.

The most powerful Hulk version ever seen took a good wile and a ton of circumstancial stuff for him to get that mad. Betrayal from his closest friends and allies, massacre of his people, the death of his loved one and his unborn child, etc, etc. This will be a series of circumstances that will be hard to match.

We see Savage Hulk getting neutralized and even defeated by a great number of individuals. To top that off, we still dont know how the Green Scar would have handled Marlvel’s standing powerhouse, Thor. Sure, we saw how he ducked it out with Sentry, but even that was heavy PIS (plot-induced stupidity).

Beings like Thor and Sentry already are at their “max” limit. They actually chose or force themselves to be less than their full potential. We have seen Thor crack planets while fighting his peers, and we just saw Sentry roflstomp a god.

To top that off, both those beings have powers to alter reality in some fasion via Mjolnir/Odinforce and the stuff that created the Void and mind-blanked the entirey of the Marvel U memory. Hulk cannot do such things. Not directly anyways. His gamma radiation may have all sorts of crazy unknown effects, but He has yet to focus it directly to some major reality warping feat.

All of that makes Hulk less than a real prospect to be considered the top tier of this OP universe.