Board Thread:Speculation House/@comment-4830106-20131108040231/@comment-4830106-20140211163522

It depends on exactly what the Grimm are. If they're just monsters or animated constructs (it's not impossible), then there probably isn't a hierarchy per se, but there are creatures that are stronger than others. Besides, strength is relative. A large horde of Ursi--even Beowolves, in large enough numbers--could potentially overwhelm a Deathstalker, and I could see a King Taijitu (spelling?) snatching a Nevermore out of the air, if possible.

However, there is the (crack)theory that the Grimm are harnessed by either a hive-mind or a central guide (like Sauron), which explains why they seem hellbent on destroying humans and not fighting each other. Therefore, the highest tier of Grimm would be either humanoid or have human intelligence. And if done properly, that would be really cool.