Grandmaster had
Spoiler:
two years to watch the Hulk fight and get an idea of his prowess. Yet, despite that, he still felt the need to intervene on Hulk's behalf during the fight with Thor. And no amount of mental backflips can change that.Also, we can now confirm, via direct comparison, that Thor has a notable durability edge over Loki. They both took the exact same Hulk ragdolling, yet Thor recovered from it much more quickly than Loki did.