When multiple toons hit 100% TM at the same time, it is random for who goes next (unless they changed it and I missed it). So 2 hans going against each other its random who goes first. So in your example, if your Thrawn and w enemy Jedi hit 100% TM at the same time, its possible for the Jedi to go before your Thrawn by random chance. Your Thrawn may also be passing TM and it can just be hard to see at 4x speed.
In your case, I'm assuming its related to the 15% bonus TM Jedi get under Bastila lead or the additional speed they get under Revan lead.