I would recommend the Guide to Advancement starting at this section:
126.96.36.199 Positions of Responsibility
I don’t know what “show more leadership” means. Does the unit have established expectations for PORs? Are those expectations reasonable?
“When a Scout assumes a position of responsibility, something related to the desired results must happen.”
“188.8.131.52.3 Meeting Unit Expectations. If a unit has established expectations for positions of responsibility, and if, within reason (see the note under “Rank Requirements Overview,” 184.108.40.206), based on the Scout’s personal skill set, these expectations have been met, the Scout has fulfilled the requirement. When a Scout assumes a position, something related to the desired results must happen. It is a disservice to the Scout and to the unit to reward work that has not been done. Holding a position and doing nothing, producing no results, is unacceptable. Some degree of responsibility must be practiced, taken, or accepted.”
“Only in rare cases—if ever—should troop leaders inform a Scout that time, once served, will not count.”