Joko's Ninja Exchange rewards!

 Spoiler

As you can see, the inventory is full. No slot would've opened up in Etc as I have 51 of them.

Im not saying that its a useless "glitch" as it doesnt give any good etc things. I was just wondering if it'd work for other aspects/categories such as equip, use, mesos, etc.

Don't fill up your ETC while exchanging; you could lose a potential Tao. ;-;