"Since when does it need to say all out for it to be all out? Was it said "all out" during his fight with Seth, Surtur, Dark Gods, or Ymir? "
It was stated/implied/showed he was using is full power. Compare the consequences his fight with these beings was having on earth with the one of Thanos.
Or you can go by the simple rout: He didnt went all out with Thanos because he didnt showed the half of trouble he had with others.
"K.O.ed Surfer in one blast. Then had trouble with Thanos using four to five hits. He even pulled out Gungnir to put Thanos down. Guess what, he didn't. "
First of all dont compare Surfer with Thanos. Thanos is levels above. Of course hes supossoe to take more. And yes he took Gungir. How much of the fight lasted after that?
"Um, he had some trouble getting up. After that, when Bill and Sif jumped in, he was fine and ready to battle."
Then why didnt he? Against Tyrant btw, why didnt he also. Ill tell you why, because he couldnt.
"? Endurance and durability. Heck, the fact that Tyrant destroyed half of his citadel only to have Thanos get up after that. Heck, Tyrant was decimating the herald level beings. He even said Thanos wasn't like the others. "
That Thanos is above herald level we already know. Since when he wasent?
And again that s a durability feat. Not a power one.
"Winning? It's not a win. It's a durability feat. I don't count it as a win. I count it as a feat of durability. "
This one is deja vu all over.
"Depends. Odin put Drax and Surfer down each in one shot; Tyrant didn't. Odin burned only a portion of Thanos' suit. Tyrant, however, burned half of Thanos' suit. He looked worse after his fight with Tyrant than he did Odin. And he walked away from Tyrant, but wanted to fight Odin some more."
Then wy didnt he? What happened next. Are you implying its because Odin couldnt fight no more? The outcomes are similiar. He lasted because of his durability, none of the two opponents wer hurt by him. Theyr his superior plain and simple.