Board Thread:Speculation House/@comment-27027823-20150928204654/@comment-4010415-20150928213540

ChishioKunrin wrote: Basically, it's like the difference between stupidity and ignorance.

Stupidity means that one cannot learn. Ignorance means that one simply has not learned yet.

A young, ignorant Grimm seems mindless, as it hasn't yet learned that impulsively rushing head-first into a fight is a bad idea. Older, wiser Grimm who have survived and learned from their experiences have knowledge of what does and does not work. Therefore, they'll be more cautious and patient than a young Grimm. Both are equally intelligent, but one has learned more than the other. ^ Read what I said.

Also, as for why older Grimm haven't taken over... They've had generations of hunters heading out to perform population control. That seems to be what CFVY went out to do before the dance. During Field Trip, one of the mission types on the list was "Search and Destroy," which is exactly what it sounds like - search for Grimm and destroy them. It's a hunter's job to destroy as many Grimm as possible before those Grimm can become old enough to develop a higher level of strength, thicker skin, and more armor.

The Goliaths are among the old Grimm who are trying not to draw attention to themselves, so they can live to see the day that Humans slip up and give them the perfect opportunity to do the maximum amount of destruction and killing.