DL - because guys grow into the potential body mass in ways that can help them.

But any position that involves speed, twitch, along with nonstop practice to keep the technique up, missions are a net negative.

And one downside - at least for performance - that is impossible to calculate, is that guys gain perspective. The best piece of the college coaching toolkit is having a bunch of kids who fanatically believe that whatever they are doing is THE most important and amazing thing. If going on a mission doesn't change that in a kid, they didn't do their mission right.