User blog comment:DeadpoolN7/Mass Effect 4/@comment-3430127-20121016130500/@comment-818862-20121017221241

All they do is show Cerberus with a base on the the other side of the relay, studying Collector tech. They do not mention what Sheppard did, leaving it to your choice in the game. The books only revealed that Udina was Councilor after the Collector incident. It says nothing as to how he became Councilor. Again, leaving it to your choice. Besides, it saids in Anderson's Codex entry that he stepped down after Mass Effect 2 because of the pressure if he was Councilor in ME2.