Thank you for writing a response to this issue. I can tell that you are very passionate about this debate. I'm the one who wrote the long response on the previous page giving my perspective as an athlete in question. I want to clear up some things about the culture within my faith that may give you more of an understanding of what it is like to be in my shoes.
In the culture of my church, our main priority at this point in my young life is to start and grow a healthy and happy family. Another priority to do before that is to serve a mission. Both of my parents served missions, and I know that in doing so they blessed their lives and my life immensely. It was always a goal of mine to serve before I was ever aware of any hypothetical advantage in a college sport.
To be able to achieve both priorities, the simple way is to go on a mission right out of high school before entering into serious dating pools and starting your education. (In fact, many are encouraged to break up with their current boyfriend/girlfriend as they go out on a mission, as to eliminate possible distractions). This will also allow one to focus a straightforward education to career path once coming home. Thus, the culture is heavily skewed towards leaving earlier rather than later.
If you want to marry someone within the church, then this is also a must. The reality is, there aren't too many of us members of the church, and many of the amazing other members (especially girls, who don't serve missions as often as boys), are already taken and married after just 2-3 years of college. I realize that this cultural leap is a difficult one to understand if you aren't a part of it, so I'm asking you on your part to be respectful of doing that!
At the end of the day, if I was told that I would have had to surrender my running career entirely to serve a mission, I would have done that in a heartbeat. Knowing them personally, I will tell you right now that many of my teammates including Conner Mantz and Kenneth Rooks would have gladly said the same thing.
Running and athletics are just a small, small part of life. My opportunity to run for BYU will eventually become a thing of naught. However, my faith and devotion to my Savior, Jesus Christ, will last me until the end of my life, and into the life to come.
Now, if you'll excuse me, I have to get ready for church!:) Have a wonderful sabbath day!