We also had the experience of playing with a couple of kids that missed a lot of practices. They were also the difference makers in games. As much as the coach wanted them at practice they would miss. He would bench them on occassion for part the first half, the team wouldn't score or would give up goals but when they were put into the game, goal, goal, goal. Just a lesson that some kids that are very faithful about going to practice, trying to be the race horse were really just donkeys wearing a racing saddle. Coaches that don't play their best players, regardless of why they are missing practices, will not only lose the ones that miss, but will lose other starters too. Then you can have a team of complaining parents with all C players. Nothing wrong with tier 3 or bronze, train those donkeys in soccer all year long and you know what your going to get...donkeys.
My own kid played three sports her freshman and sophomore year--xcountry, soccer and track and played club soccer. Her xcountry and track coaches knew that club soccer would almost always win out when it came to showcases, but for the most part, there was no conflict. After a summer/fall of both soccer and xcountry, when she walked on the field as freshman playing varsity--she was in better shape than 95% of the team (all those kids that just played soccer). She was also in better shape for club because in both the fall and the spring she was running. We found that there was no lose in her muscles or form, but then again, she wasn't training nor competing at a world class level in which the little things such as how we train our muscles really takes affect. She decided to not run her Junior and now this year as a Senior. She had a club soccer coach tell her that all she needed was soccer training and she would be fine. As an elementary and jr high student, she played softball, did track meets, did club swim, dance and competitive soccer.
She will also be playing in college next year.