Bingo Cookie. Every ferret is individual and there are plenty that buck the "rules". We've got jills that kill under more than hobs, hobs that are fast and keen, jills that are slow and methodical. Big jills, small hobs, lazy ones and mental ones.
Anybody who says "jills do this, hobs do this" haven't owned or worked enough ferrets. What they mean to say is "I've only ever worked jills/hobs, but will give you my opinion anyway despite the fact I don't know any different".