I coached a wing who had been ranked top-100 in California since 6th grade.
Ranking fukking 6th graders.
It REALLY fukked him up. He thought he was hot shyt and we were rolling out a running, pressing team that had to do a ton of conditioning. He didn't want to run like the other guys, didn't want to train hard. It got to the point we had to suspend him from the team. He had sick skills, but he wasn't so dominant that we were gonna sit there and let him take the whole team down but not respecting the coaches or the training necessary for us to win.
He eventually apologized and started doing the shyt he had to do. But to end a long story, poor kid stopped growing in 8th grade. By his senior year he was an undersized pg trying to make due with a high motor and court vision, all the brilliant midrange game and footwork he had shown as a kid was almost useless. He went to JC and didn't get any burn at all. Shows how much 6th-grade rankings matter.
(p.s. - reminds me of a different kid I coached, he was a nobody before high school. Literally no one knew who he was, had made zero splash. But in 9th grade he starts developing his body, has a fantastic work ethic, and just keeps getting bigger and bigger. Gets signed to one of the top D1 programs, eventually becomes team captain and a four-year guy, the kind of player everyone knows their name even if he only has borderline pro potential, someone takes a shot at him near the end of the draft and he managed to carve out a little career for 4-5 years. And the kid is STILL humble and works hard to this day.)