Board Thread:Speculation House/@comment-71.17.68.254-20130907025506/@comment-25555436-20150415234100

...anon, in case you never realized, Grimm gain more armor as they get older. Compare the Ursa Major to any other puny Ursa seen before, it's more than just bigger.

The DS is implied to be extremely old, likely from the times where people still wrote on rocks and walls using stick figures and such. That could easily be hundreds, thousands or even millions of years. If in all that time a Grimm didn't become much more inteligent than a "newborn" Grimm, then their only real strength (that they get smarter as time passes by) becomes an Informed Ability and they become even more of a total joke.

Phantom said somewhere that maybe it was old, but lacked experience, which is a more reasonable explanation. And if it isn't the case, then Monty, Miles and Kerry fucked it up.