Am I misinterpreting the usage of the word "leading" in skill descriptions (because of poor translation team) or does it mean to set the unit as a leader of the specify unit type?

Mori Motonari has a skill that says she can attack 1 extra unit "when leading archer unit". Mines a Marksman but not a leader and yet still hits 4 targets despite marksman ability only hits 3 targets. So is "leading" in skill descriptions simply meant to mean "have class set to"?