Black Knight Leader is, how to say this... Like a Star Wars lore ayatollah. The lore is sacred, the lore is immutable. And if it contradicts itself at passages, he finds a way to make it look like those passage complements instead of contradict each other.
I do find a little bit inappropriate that they use a full Grand Admiral of the Navy to deal with a small cell of "terrorists and pirates". That is something that intelligence (Kallus), the Inquisition, or tops Vader (the guy that gets things done in the Empire) should take care of. Not a military strategist, that fits better at carrying out campaigns of conquest or military expansion, than as a policeman.
Vader, the Inquisitors, or Kallus are specialists at dealing with jedi, spies, and saboteurs. Thrawn, or the other grand admirals, should be more about moving taskforces and extending the Empire.Or researching and deploying new warmachines, or whatever. He is Napoleon, not a ninja.
I understand where you're coming from, but isn't that the point though? The ninjas have failed to stop the heroes from developing into more than just a small cell of terrorists and pirates. Season 3 seems to be upping the ante and turning the Rebels into a real military force. And the Empire is always looking to apply the method of overkill, so why not send in Napolean?