Coach was an official

[jTheUmp]

Coaching and officiating require different skillsets.

Officiating involves knowledge of rules and mechanics, judgment, game management, consistency, and physical fitness.

Coaching involves instruction, motivation, some rules knowledge (although I hardly expect coaches to know every single rule and caseplay), and the patience to deal with the attitudes of various players (and their parents).

A great coach might (or might not) be a great official. A great official might (or might not) be a great coach.

My typical thought when a coach tells me he/she "used to be an official" is "Well, there's obviously a reason you aren't one anymore."