what is the least requirement for getting 3rd pose?

I want to get all the poses for all the characters (just wanna see how they look) - but with shortest amount of time

my Shun got to 6 dan above 300 matches and reaching 5th arcade and already bought all the poses (not finish all quests) but I did finish about 6 underground tournaments when I begin with him

my Aoi got to 8 dan above 300 matches also reaching 5th arcade and still did not have 3rd pose available (finish all quests in 1st to 4th arcade) only finish 1 underground tourney

So I wonder what is the minimum condition for getting the 3rd poses, anyone know?

 

Beat all the arcades.

 

beat all the arcades would not be the point Ok, fool

The point is why my Shun beat 4 arcade and got all the poses and my Aoi doing better and still dont have the 3rd pose?

 

Beating 5th arcade should unlock Aoi´s 3rd pose, if I remember correct.