It might be a good idea to offer someone an opportunity to develop their skills - but that's not the same thing as getting them to do your job for you!
In particular, do remember that Planned General inspections (PGIs) are a management responsibility. A CSS might accompany a CSM - if they want to - but managers certainly can't get CSSs to do the inspection for them.
We understand that this reminder might be timely and useful for stations at the north end of the Victoria line.