nicolaou, Like Giordano said, being an elder will likely expose your brother to the uglier side of the Borg.
My hubby, who is also an introvert, was an earnest elder who was never on a power trip. However, as an elder, he saw the backstabbing, favoritism, nepotism, egotism, etc. displayed by his fellow elders behind closed doors.
There were shouting matches at elders meetings. One elder was an alcoholic, one chocked his daughter and raped and beat his wife, one had an affair with a married sister with 3 kids, one was a scammer, and bilked elderly sisters out of tens of thousands of $.
The last straw was when he notified the body of elders and the CO that a brother they were considering to appoint an elder was arrested for pedophilia years before in another town. My hubby knew because he was distantly related to one of the victims. He even had an old newspaper clipping naming the brother as the accused. The brothers, the CO ignored hubby"s warning and appointed him. Hubby wrote the Society. They ignored him.
Seeing that awful scenario play out led to Hubby's permanent exit out of the cult. Maybe your brother will witness first hand TTATT.'