The injury rate for HS is very high compared to club. In CSA last spring, there were seven serious knee injuries requiring surgery to ECNL/Premier level players that were in their first year of HS.

Not certain I agree here. Do you have stats to back up? I know that the club team that I'm familiar with has had four season ending injuries this fall (two knees, one back, one leg break) compared to zero for the high school team last spring. I surmised that maybe the HS teams placed more emphasis on preseason conditioning and proper stretching as opposed to just showing up and playing as I see in club.

As for the original argument, if the club tourney is during HS season, then the player should play HS soccer. I don't think many club coaches are going to lose their HS players November 1-21 due to HS fall practice being allowed.