LOL! I'll still always know him as Buggin Out,
As to him being the main "bad"? I certainly think so.
Herzog, (although flanked by dirty spent troopers) I'm guessing his role plays out once he gives the Mando the mission, his time is up.
While the more legit, and extreme Imperial holdout, actually hunting down the Mando (and company) , appears to be Esposito's character.
Who is flanked by Death Troopers, commands the Flame-Trooper (name?) and still flies a TIE.
Looks like Esposito will be that part of the Empire that does not want to die, and will be pursuing the Mando and whatever they are after, (burning as he goes), throughout the series.