I miss his direct influence on Jack's adventure, though. Samurai Jack without Aku is weak. I know its early in the season but like you said, we've only got a grand total of 10 episodes, and Aku only being in three of them, one we have already seen and one which is presumably the finale, is a depressing prospect.
I want to see him get his mojo back to fuck with Jack again. I want to see him wreck Jack's shit. I want to see him use Jack's burgeoning relationship with Ashi (regardless of its context) against him. I want to be reminded exactly why Jack is striving to destroy Aku by having Aku return to the bombastic, fantastically evil SHOGUN OF SORROW he is, so that when the final showdown happens it feels fucking incredible because the show reminded us that the conflict between Jack and Aku is important in this season, not just because it's expected due to the pre-revival seasons.