At the GM’s option, henchmen without character sheets have an effective skill of 10 + absolute value of BAD: 11 at -1, 12 at -2, and so on. As with all BAD things, this is abstract. Actual skill, equipment quality, extra time, and anything else that might matter is all rolled into one handy number. -- GURPS Action 2, page 5
Last time, I looked at BAD. I meant to look at Mooks too, as that's the real point of this exercise for me, but I took so much wordcount just looking at BAD itself. With that out of the way, let's look at Mooks themselves.
I will note, as I noted last time, that Mooks in Action, don't actually have (Absolute BAD)+10 skill; per page 45-46 of Action 2, they have skill 10-15, which might be completely unrelated to the BAD. Skill seems to be all that matters: they have a static Dodge of 8, Parry of 8, and ST of 10. The game largely takes damage out of the equation, and that makes sense: with guns available, characters who get hit tend to get removed from the fight pretty quickly, so we'll largely dispense with weapon other than to note melee vs ranged and focus on chances to hit.
We'll focus almost entirely on combat capabilities (Action even suggests not using BAD for combat), as that's the point of balance I'm most interested in. When it comes to things like "I try to Fast-Talk the guards" I'm fine with just applying a BAD penalty.