Obviously, in the military, you NEVER want a guy to fail during actual operations ----
BUT -----
most CPOs and officers are not above rigging drills or exercises towards showing guys a weakness in their approach that could be improved. This is especially true during refresher training, when you are trying to integrate new guys into the watch and casualty teams. They HAVE to depend on others; proving it to them is part of the purpose of the drills/exercises.
Obviously Major Leaguers (TM) are highly skilled and have practiced their craft over and over. Whether they take kindly to suggestions for changing something may require some sort of shortcoming before they are fully receptive. The long season makes this somewhat practical, but it's obviously subject to judgement and scrutiny, especially with pitchers. But it looks to me like Stottlemyre is not afraid of stepping in and suggesting things which have pretty quick results -- but only after the guy has tried himself, which is as it should be.
And, in comparison, providing power to a CVN in the Gulf, or to an SSN/SSBN under the ice, is major league, too. But the pay isn't quite as good.