I am curious about your assessment of aggressiveness. I did state on the record that until more users earn 3000+ rep, I will take 2+ closure votes as an indication that there may be a problem with the post.
To date I've voted twice times (unless I miscounted) to close questions unilaterally.
https://math.stackexchange.com/questions/12888/is-kolmogorov-complexity-recursively-enumerable-for-some-infinite-set-of-strings is based on the OP's own admission that the question is a duplicate of a previously asked question.
https://math.stackexchange.com/questions/14881/there-are-how-many-modes-between-4-number-closed is impossible to tell what actually the question is about.
Two other votes have 2 supporting votes prior to my casting the closure. One is about whether MatLab supports object oriented programming, the other is the one linked above.
All other question closures that I am involved in otherwise have five total votes.
AFAIK Robin hasn't taken any real action yet as moderator, and Qiaochu has only closed one question with something that is not the fifth vote (and his is a fourth vote there).
So forgive me if I am taking this a bit personally. :)
I understand that you have some concern about this one question. And I can see how it is frustrating if you have written up an answer only to not be able to submit it. But I cannot see how there can be controversy on the other three times I acted without having the full five votes. Since I did promise to listen to the community's opinion (and you made a general accusation of aggressiveness), I would also like to know if there are general concern about whether I closed the other three questions (to which this issue applies) too hastily.