Someone is Missing (Quest Issue)

I wanted to clear the side quest in Ala Gannha called "As Stubborn as Stone" where I must speak to three people after the quest is initiated. When I try to look for the 3rd person, whose icon appears to be at the top tier of the town, they cannot be found. Where is this 3rd person?

Did you climb all the ramps, to the very top of the pueblo-like structure? Because that person is sitting - or should be sitting - in a rickety chair up top.