Originally Posted by
godisawesome
It says something that Thanos brought the entire remaining Black Order with him when he assaulted the Asgardian refugees, even though he possessed the most purely powerful Infinity Stone; he wasn’t taking any chances, even as it turned out to be overkill. And it’s implied Hulk still must have torn through plenty of Thanos’s conventional forces to still be going at full power even after Thor is down.
Asgard at full might is likely a close enough one-to-one match that Thanos could not afford to fight them when others might join in; even when he actually possessed the Mind Stone, his only intrusion of Asgardian territory was on Earth, one of Asgard’s old protectorates as Midgard, and he did so through Loki (another Asgardian) as his proxy. Heck, the Asgardians seem to have the military power to not need Infinity Stones as their weapons of war, since they keep locking them away from themselves and hiding them.
He clearly had the might necessary to destroy Zandar, but again initially insisted on a proxy, even though that meant inserting a too-often-defiant Ronan as a middleman to him possessing the Power Stone. The Kree might be considered about even with the Zandarians, given their eventual peace treaty at the end of long periods of strife, but less likely to intervene on Thanos’s plans out of their own totalitarian ambitions.