I'm pretty sure Thrawn's troops (except the one guy with a metal face) were always undead. Bringing back the dead is kind of the Nightsister's thing, and in the group shots, you can see every trooper has ribbons of their clothing wrapped around their uniforms. Whatever caused them to be nigh-unstoppable zombies is something extra, and presumably involved some sacrifice on their part. Savage Opress was undead in the first sense in the Clone Wars cartoon, and presumably in this show so was Marrock.
25:19 Those last two parries happened only because Ahsoka chose to use the same axis of attack with both blades, instead of swinging them in two different directions or from two different angles.
25:37 That whole fight. Ahsoka swings both blades together, so they can be blocked with the same parry, or she only swings one, and holds the other back or two the side. Even when she has one blade locked up with Morgan’s she works that one, instead of bringing the other one around for a free shot, or she brings the second on in to join the first.
This is a problem with almost every 2-lightsaber vs 1-lightsaber fight. Or even, say Darth Maul vs Ahsoka in clone wars season 7. Several times they each have to be trying not to kill or maim the other to continue the fight. It's worse in Ahsoka because it's real people that can't be animated to do improbable things. Or consider Ahsoka vs Morgan in their Mando episode - how does Ahsoka not slice of Morgan's hands every time they go saber-to-spear? Or how does that not happen regularly in lightsaber-to-lightsaber combat? There are theories online that light sabers 'grip' each other at the point of contact, but I guess there's at least one scene in the canon movies where that doesn't happen.
Lightsaber fighting is a big inconsistent mess.
They should have spent less of their special effects budget on tribal turtle people and more on animating Jedi to move like Jedi instead of 50-year-old ladies, though.
I don't want to spend the kind of effort you do into all this, but live-action Ahsoka is a big disappointment, particularly after Mando seasons 1 and 2, and Andor. I know they can do better, but they didn't.