Iron Man has KO'd Hulk once. Hell, his Hulkbuster armor did jack-f*ck-all to Prof Hulk when Prof Hulk wanted to trash the gamma bomb factory. Savage Hulk is easily more powerful than the Prof Hulk. So if this is standard Iron Man, besides one showing in his entire history where he KO'd early Hulk - a very weak Hulk compared to today - by using every last ounce of his energy, Iron Man is almost a non-issue in this fight. Feats against early Hulk don't mean sh*t. When was the last time an explosion, any explosion, has stunned the Hulk? And if Iron Man does that absolute all-out punch again, he's basically throwing the fight.
Namor is the only contender in Team One. Once again, a bulk of his victories are on early Hulk. One or two of those victories are not ones Namor could easily repeat, considering Hulk no longer even needs air. For Hulk to be screaming and shouting in open space clearly indicates no need for oxygen. So Namor's only water advantage is speed, maneuverability, and strength that comes up into Hulk's range.
So I'm not saying Savage Hulk does solo. I'm saying he could. Potentially. And a good chance of it. So could Hercules.
I like Namor, but he's one step below Herc and Hulk's league. And Iron Man is two steps below Namor's.