Well, from my understanding you'll just get the base version of the weaponskill added to your attacks. So if you do Gust Slash 200 potency + Base 100potency. Spinning Edge 150potency + Base 150potency. I'm not entirely sure how Aeolian Edge and Armor Crush will work though, because at their base in the right position they're 180(rear) and 160(flank) respectively.