But if G0-T0 is fighting a gang war on Nar Shaddaa how can he also be messing up Tybers power base? Tyber is coming from a much better starting position the only way G0-T0 can win is if he fights a guerrilla war. Which Tyber can defeat by bribing his forces and hunting down G0-T0's strong hold, which he then attacks in force (why would Tyber NOT use Nightsisters on Nar Shaddaa? Rancors on Skyscrapers sounds like win to me) and forces G0-T0 to defend him self or lose his only power base.
Another way is to find and blow up the HK factory, we know from the in-game content that the HKs have a homing beacon that can be used to trace them back to their place of origin, so Tybers' techs figure it out and then BOOM, no more HKs.
Also jedi can sense DANGER as well as intent. Ok well 1. I had too scenarios; The first had Hanharr side with Tyber before he even gets to the planet, in which case he could just destroy/sabotage the droids on the way there. In the Second one Urai didn't face Hanharr until AFTER all the HKs were destroyed, so either way the point about them is moot.
Also why would Hanharr not join Tyber? He can offer him just as much (if not more) bloodshed then G0-T0, who keep in mind likes order not chaos, so Hanharr would be disruptive to that. Maybe Tyber could bring that up "Hanharr, you are a mighty warrior, but surely you must realise G0-T0 will kill you after this join me and you can kill to your hearts content." OR some such argument.
His 'forces' can be beaten and Nar Shaddaa placed under blockade, as the planet starves (major issue for a city world) what will G0-T0 do?
Also the whole Traya thing bugs me; If you have contained the enemy threat why not wait them out? I could buy Revan being rash or impatient or just think he was unbeatable, but Tyber he just say 'Let him rot, I've got a galaxy to corrupt. HAHAHAHAHA" Also Revan surrendered, even though it was explicitly stated in the op that you can't/won't.
Any way, I never said you bribed Hanharr, he was working for Voga the Hutt the entire time. My point was that he was not loyal to G0-T0 the same way Urai is to Tyber. he wants to kill and kill a lot, G0-T0 likes order Hanharr is not conducive to order, thus he will kill him after the war. Also Tyber can offer him just as much if not more bloodshde/chance to fight Urai then G0-T0.
Also about influence, G0-T0 can influence markets and economies but he can't effect regime change directly. He could work for months to position his pieces and set up for a friendly government to take over a planet, then have Tyber come in and take out the new guy with his army.
A fun way I could see this ending is Tyber and G0-T0 teaming up to take over the Galaxy. Tyber will provide stability and military forces will G0-T0 manages the books. They would be a joint entry, meaning that they wouldn't have any allies as one fills that spot for the other.
"Jedi, Sith, Empire, Republic. Their time has past now comes the age of the Consortium." The full name is the Zann-G0-T0 or G0-T0-Zann Consortium.