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As far as elevation is concerned, 5000 feet isn't really all that significant.  Oxygen content goes from 20% to 17%.  I've climbed Whitney at 14,500 and oxygen content drops to 12%, and at that altitude nausea and fatigue is commonplace.  So a slight factor at 5000, but not a major one for a youngster.  Maybe a big kid like Betts get fatigued at 10 minutes instead of 12.  That kind of thing.

YMMV. I did swim meets at 5,000ish feet in high school without getting to do any acclimatization. My experience sprinting at that elevation is that you reach the puke zone much quicker than at sea level. And basketball does require you to do repeats of short max acceleration sprinting. I don't have the VO2 max of a DI basketball player but I was in great shape in high school and that experience was unpleasant enough that I remember it decades later.

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As far as elevation is concerned, 5000 feet isn't really all that significant.  Oxygen content goes from 20% to 17%.  I've climbed Whitney at 14,500 and oxygen content drops to 12%, and at that altitude nausea and fatigue is commonplace.  So a slight factor at 5000, but not a major one for a youngster.  Maybe a big kid like Betts get fatigued at 10 minutes instead of 12.  That kind of thing.

YMMV. I did swim meets at 5,000ish feet in high school without getting to do any acclimatization. My experience sprinting at that elevation is that you reach the puke zone much quicker than at sea level. And basketball does require you to do repeats of short max acceleration sprinting. I don't have the VO2 max of a DI basketball player but I was in great shape in high school and that experience was unpleasant enough that I remember it decades later.