The threads I have read by grimm has been valid and actual ideas. Maybe his explanations are a bit... lacking?
To me at least, that is part of the defintion of a troll. Complaining without any room for explanation. not just on the odd occasion tho, but what seems as a rule.

take this post as an example. He says "we need to work this game from ground zero". Ok, so now what. Say SE took his comment seriously, where would that leave the game? Nowhere, because he has no development in his ideas.

He considers a single suggestion and throws it out without consequence. to me, that is a troll.