Graviton could clear this entire gauntlet at the same time by himself. He's only been beaten via insane plot devices- almost never one on one.
Stops at 7? he's already beaten/immobilized Thor before, and BRB is just more of the same. Enraged Hulk has no way to hurt him- graviton could simply levitate him above the earth's surface, then pummel him with energy blasts until he passes out.