Isnt an episode that these two are fighting with some moral values such humans against machines story?

We may want to look on that. We dont need references of a backstory so much as something that the viewer can think..

Like redletter media said "things might sounds trivial but we never see these connections we have to be told about them."

So assuming that lucas had in mind we know that clone wars could fill the gaps and create this backstory still we never see a sh*t in the movies.

From the other hand a character who doesnt talk isnt much as a timefiller right?

So instead of these two i suggest to put some moral values like i said above..

well its an option :)

-Angel