Despite saying it in their Civlopedia entry, Jaguar warriors do NOT turn enemy units into builders upon defeating them. There's not even a % chance in the combat stats when hovering over them like there is with Eagle Warriors.

Apologies for posting here but I am playing the game through Friends & Family Library Sharing so it does not allow me to post comments. (Stupid, huh?)

[edit] Tested this with MOAR units, and it works fine on there. It's JUST this mod.