Thanks!
I got it to working though - issue was that I gave the new troop the Guard_lv_6 enemy, and the attack used there has a hardcoded pre-condition that certain guard edicts have to be available, else it always returns false. Normally never an issue since the Guard_6 does not appear without that edict ...
Anyway - since some pages ago I saw a certain wish to battle against Yasu more often than just in the tutorial - tiny mod here, adding one enemy, one troop, and one event on the stairs to Lv3 map.
Hope it works and if so that however likes to use it, likes it