User blog comment:JakePT/New Information from PSM3/@comment-743796-20110422153317/@comment-1596833-20110423185708

Actually, the Captain of the ascension is unknown, and it even states on the Destiny's page that she may be the councilor. Or at least the last time I checked. And it may be that Anderson was:

A)Offered the rank, and depending on the outcome of Mass Effect's ending, took it or kept it as a title, merely taking the rank, then resigning.

B)Has the rank outside of citadel jurisdiction.