Guys, Darth did good research about animation files, and i can confirm that in vanila game there is nothing that links unit look to unit resistance. All units have the same values used.

Standard values are -0.090000004 0 0 -0.34999999 0.80000001 0.60000002

where

-0.090000004 = min effective pitch for left hand (animation node)

0 = max effective pitch for left hand (animation node)

0 = max effective pitch for right hand (animation node)

-0.34999999 = min effective pitch for right hand (animation node)

0.80000001 = probably works as an attack modifier for the skeleton (The bigger the more)

0.60000002 = probably works as a defense modifier for the skeleton (The bigger the less)

Same line is applied for armor upgrades. so there is no secret system that links unit look with armor protection.