Thanos has had fist fights against Mad Thor with the Power gem Thanos has also had fights against The Marvel Universe's most deadly Army and had little to no trouble beating them. Also you talk about fight Odin and Thanos did not fight the battled with powers totally different. Thanos has combated Thor Thing Drax and I believe Silver Surfer all at same time. Even if Thanos is not as strong he has Milena of fighting experience of Hulk and not to forget his Superhuman I.Q