maybe, I'm stating the obvious; but no-one seems to have noticed the Sol Banking Corporation.
if no-one can remember who they are look at the top of page 48 in the manual.
Failing that, look on page 10 of the Timeline (it basically states that there is a all-out trade war going on between OT and the Sol BC - who are itching to invade Rubi Ka).
Maybe the Sol BC will be the third party, that, will either destroy both OT and the Clans or force them to join together against a common enemy.
Sol BC has been mentioned too often to not come into the game somewhere.