Battle passes are like one's identification card in the league. Each pass has a unique identification number, which will be linked to a candidate. Of course, one can impersonate another candidate using a disguise card as long as they can acquire the battle pass. In that case, they can only try their best to not get caught because it can result fine or even jail as punishment.
After several millennia filled with such incidents, people rarely try to do that.
Azzy and Leah joined up the line. Neither of them had any intentions to pretend like a pig to eat a tiger. So, both of them didn't suppress their soul power.
There are several Arcana Masters who looked young. So, no one gave them too much attention until they reached the verification zone, where a high-level official is checking their battle passes. This guy is a peak-rank-7 expert. So, usually, no one dares to argue with him.