Interesting to break this down into logical ideas:
It makes [no, some, all the] difference whether kids [always, sometimes, never] train together in [all, some, none] of their practices for a team sport [when compared to nothing, when compared to having slightly better players available to the team, when compared to having much better players available to the team.]
The problem I always have with this thinking are the shades of gray. I'd rather have a vastly superior individual on the team that didn't practice with the team than a vastly inferior one. I'd rather players practice much more often individually than not practice individually so that they could only practice with the team. And so on.
Years ago, when I dealt with CESA directors and coaches, the discussion was around the shades of gray part.
