A scout with activities other than scouts and a rule that he has to serve 12 months when the requirements state 6 is just plain wrong. It is a classic example of a troop adding to the requirements. There's just no valid reason for it other than adults making stupid rules. If a scout is required to serve 6 months and does 9 with time off for a season of sports, it still counts. And the extra 3 months shows he does care.
Had my committee made such a rule for my troop, I would go to bat for the scout and personally help him through the appeal process and if that irked the committee, he and I would both be looking for a new troop.
I often wonder whether or not some of the scouters out there can read plain English. Seriously, the BSA handbook isn't written in Hieroglyphics or some sort of Enigma code.