The Bypass for Gothic Harness is 9, I believe some of those NPCs are meant to be wearing Gothic Half Armor which has the lower Bypass value (no leg protection, basically). I’ll double check and make sure those stats are updated. Thanks for pointing it out.
Where there are two stats for armor, it works as follows:
In a ‘normal’ attack, meaning no Bypass is declared, the assumption is that they have attacked the heavier armor. So for example, if you attacked a Mounted Crossbowman as seen in Monsterberg I, if you do a ‘no bypass’ attack you are assumed to be hitting the Brigandine (or the helmet).
If you decide to Bypass, you can try to bypass ALL the armor (Bypass 7) or just the Brigandine and Helmet (Bypass 5).
It’s a lot easier to punch through the Aketon (DR is only 2-4) so that may be the better option in some cases.