The top 7 runners are the Varsity team, which is why they earn a Varsity letter. That is the rule for cross country. The runner who is #8 or 9 all year is a JV runner, and thus got a JV letter. The criteria for earning a letter is spelled out for the coaches at our HS and it has to be followed. For a Varsity cross country letter, the athlete must score 10 Varsity points during the season. Period. The coach has no authority to change the rules which are set at the Conference level. This year I had to deny my own son (a candidate for USAFA and USNA class of 2019) a Varsity letter because he got injured during the season and only scored 8 team points. He had gotten a Varsity letter last year as a sophomore.
All of the other sports at our school follow the same type of system. Track athletes must score 25 Varsity points. Volleyball players must play in 50% of the Varsity games played during the season. Football players must play in 50% of the quarters played in regular season play. Powerlifters must qualify for the state meet. Each of the other sports also has their own standards but I don't know them off the top of my head. The criteria is set and the coach follows it to be fair to all the athletes.
All athletes are recognized for their hard work and dedication, just not with a Varsity letter which is a top-level achievement.
Stealth_81