Odin, and Tyrant also defeated Thanos. Thanos had to literally steal from Tyrant in order to nearly compete with him. What are you talking about?
Bruce has always tried to dial down, or fully nullify his ability to become the Hulk let alone some world busting nightmare that scares the shit out of him daily. You miss far too much content on your singular campaign of Thanos dominance. He's a powerful guy, and if he had full abilities there may be a possibility for him to win. But pure H2H with exactly what he spoke of during Thanos Quest? Stop kidding yourself. This Hulk has resisted TP assault.
The Champion with the Power Gem may have been on par with the Hulk during his collision with Betty. May have. The Power Gem was once a fragment of an extremely powerful Abstract like being. The Hulk and I mean the Savage Hulk gave the Shaper of Worlds fits way back in the day. The Maker's explosion which made a crater in the Kiln, kayoed Thanos. Thanos fought Annihilhulk to a near standstill. The green Scar would wipe Anni out.
Thanos before the God Quarry amp would not beat WB Hulk in a H2H match where powers and/or devices aren't allowed. You may have a damaged amygdala, because you seem to be unable to properly judge events.