Also don't forget the conspicuous King Vandal fighting alongside the Wolves after coming out of the Grottos. The Kings are said to be the strongest Fallen house. It was actually the Kings that organized the Fallen alliance that lead to the Twilight Gap. Despite their strength I believe seeing direct action from the Kings is rare so they may be manipulating other houses into doing their work for them. Aksor is kind of an interesting case though. This is from the Grimoire; [quote]A disciple of the Prime Servitor Kaliks, Aksor initiated brutal crusades against human settlements beyond the City and ravaged countless Awoken enclaves throughout the Reef. When the Queen waged her war against the Wolves, Aksor was taken alive and sealed into the infamous Prison of Elders[/quote] That means the Archon Servants in the Reef were likely acolytes of Aksor and continue to serve Kaliks Reborn, the successor to Kaliks, in his absence. However thinking that the Kings' Kell is a Warmind or the Nine is just outlandish.