FFF - The Memory Priest of the Creech People

I was not a big fan of this reading.  I did not completely understand the story until I read it a few times.  A question I had while I was reading was what if the person chosen to be the memory priest can not memorize everything?  What happens if he is not capable enough to do his job?  Also, it says one person of the Creech people is chosen at birth to be the memory priest, but the author states that Creech people are untruthful and unreliable.  Does that mean that the memory priest could be deceiving everyone and giving them false history?  When I think about the memory priest, I think about a filing cabinet in a police station.  The priest is just like that in that he knows everyone's "cases" and all the details of everything in history.