(Side question here, but Goto was programmed to serve the republic, even if it meant breaking its laws due to a programming conflict at a point, but does that programming still exist? If it did, Plaegius could make himself seem like he would bring it back and he was its only hope for resurrection, thus making Goto completely unable to harm him, and making it an almost-auto win for Plaegius. I say almost cause we all know how much those HK-50s enjoy killing organics.)
The whole point of major powers not existing in the Kaggath is to avoid debating about them. I think what the rule means is that they never existed. It's not like they suddenly disappeared. The point of this thread is powerbases and their battles.
Does the programing still exist in GO-TO? Yeah, it is a major part of his programming. However, seeing as the Republic he was designed to help doesn't exist, it wouldn't make any sense for Plagueis to know about or be able to recreate something that never existed.
That's a good underhand way Plaguies could win, but, as per the rules and setting, it just isn't possible in the Kaggath.