Well, why not? Learning to be an instructor in -any- subject is very different from merely having the skill that is being taught. Being fit isn't all it takes to teach fitness. There's more about nutrition, biomechanics, sports medicine, leadership, and just plain presentation skills that someone needs if they're going to try to be an instructor.
You don’t say! Perhaps there’s a business opportunity for you there. You can relate the need for instruction in nutrition, biomechanics, sports medicine, leadership, and just plain presentation skills to their contributions to killing the enemy - pirates, for instance.
We’re going to have to agree to disagree on this one, FRiend.