A comment I made in another thread has led me to wonder about one thing. Could the following sequence of events, which might make the game unwinnable, arise?

1. Player joins the Umpani. However, due to a disability, the player is unable to complete the Umpani Training Grounds. (That part doesn't belong in an RPG, and it could cause trouble for someone unable to play action games.)

2. Player joins the T'Rang in order to avoid the problematic sequence.

3. Before the Chaos Moliri is obtained, Z'Ant realizes that the player is being a double agent and turns hostile.

This sequence of events, if it is possible, could render the game unwinnable for a certain class of players.

Z'Ant drops the T'Rang-Mook Letter when killed. You can just show the letter to Screg and he'll let you in regardless of your actual standing with either the T'rang or the Umpani. So it's not actually and unwinnable scenario, just a sub-optimal one.