As you might recall, Ju Peter is the youngest looking member of the 5 elders who serve Imu.

This caused Mr Morj, who ran through a list of previous villain subordinates, to say Ju Peter is the Gorosei who would betray Imu.

However, I think it's possible his apparent youth is an indication that he's probably the most loyal Gorosei. As he's so young, it's possible he loved during Emet's rampage 200 years ago in Marijois. This would make him a staunch enemy of anyone who'd even dare spout their stance against the world nobles.

What do you think?