1215 Demolition Expert.

It is not that the Mechanical Emperor thinks that Tanc830,428,723C is lying. He knows that Tanc830,428,723C means well with his statement. But he also knows that Tanc830,428,723C didn't become Agrivo839,371,456A's mentor by chance. 

The personnel in charge of the Mentor-Charge fixing prioritizes compatibility between the mentor and the charge. They do this based on compatibility in personality and behavior.

This means that Agrivo839,371,456A and Tanc830,428,723C were paired together after a thorough analysis of their behaviors found them to be compatible. So if Tanc830,428,723C is headstrong and problematic, odds are that Agrivo839,371,456A is headstrong and problematic too. 

Tanc830,428,723C tried to defend himself, "I don't think I was that troublesome."