The relevance is that they got to where they did by working hard and did it from the beginning. Your son has great mechanics and at some point he had great coaching. If he was a hard thrower at 9-10 and had poor mechanics he may have injured himself like so many I have seen.
If you said no to travel ball would yours on be where he is today ? Would he become unhappy and quit ? I know my son would have quit.
My guy was a great BKTB player who played 1 year rec and 1 season of travel . He was spotted by the travel coach because of his body type and because he crushed the rec teams which were CYO teams. They were actually better than true rec. The next year he tried out for the freshman HS team but was moved up to JV for 2 years and then to Varsity. He was so far behind and if it wasn't for the travel team polishing him up , he probably would have never played at HS. Several of the HS players here went on to play college ball and some pro. Daques comment about a kid making moves having nothing to do with coaching shows how dumb his view is. It is 10 times harder to get a scholarship to D1 college in BKTB than BB. Coaching is everything in developing the innate talent you are born with. Hockey is another sport that is huge here. They start at 5yo and you have to perform inorder to move on.