No direct LE experience here, but based on personal and related experience in medium- and high-speed military courses, if you're always helping your classmates, and especially if you're the guy who's encouraging others to help each other out, you will make friends and influence people.
That Guy: it's great to be quick with a joke, but it can easily be overdone. Questions should be relevant. No matter what "they" say, there are dumb questions. If you have an insight, as yourself if it's relevant and whether your classmates will benefit from it. If not, save it.
And @Gadfly is right, running in formation is a different experience than simply running. You have to run at the same pace and with the same length of stride as a bunch of other people. Even with 20 years in the Army, at times it was painful.