I ran in HS and college and coached HS XC and track for 4 years. This kind of stuff used to p*ss me off and I'd get defensive about how tough and punishing XC workouts are.
I think XC runners and basketball are both very fit athletes. But their fitness is different.
When I was about 35 years old, a friend invited me to a 6 a.m. basketball game two days a week with some other guys aged anywhere from early 20s to 50s. It was 5-on-5, full court basketball and the games lasted 45 minutes to an hour. It was all for fun, but the games were hard fought. At the time, I was running 35-40 miles a week with workouts and races thrown in and figured 'No sweat. I can handle this.' The first day my lungs were burning and gasping for air in the first 15 minutes and I had sore muscles all over my body the next few days.
Basketball players probably couldn't handle a 12 miler with 6 miles at hard tempo with the XC team. But if you don't think college level basketball players are fit, you've probably never played a full court game. They are fit as hell.