I'm joining in on this because I will take the other side. The only reason the best player at 7/8u is also the best in high school and beyond is because they are more athletic and stick with baseball. Its just that kids in the south, particularly suburban white kids will play travel baseball over anything else. Its definitely an iron sharpens iron world in the south with baseball.
But let's have you take the B athlete and shove him travel ball at 7 and I take the A athlete and stick him in a decent little league at 7, then have him play football and basketball the rest of the year until age 13 when he decides to go all in on baseball. Who's going to be better as a Senior in high school? My money is on the A athlete. Same as it would be in just about any other sport.
Last year I coached a rag tag Babe Ruth team of 13-15 year olds. I had couple of 13 year olds that were my best pitchers. Both were extremely young for the league. One has played serious travel ball in So California. His initials are TV #21. He's an average athlete, but a great ball player. The other pitcher CW #3 has played recreational ball his whole life. His #1 sport is basketball and he's also the QB for the 7th grade football team. Decent ball player and exceptional athlete. We played a 12 game schedule.
First 6 games of the year. TV is throwing strikes, CW is struggling. TV is barely in the 60's on velocity and that new 60' mound is making it feel slow. CW on the other hand has a nuclear missile for his right arm. Was touching 70, but wild as hell. Both pitched exactly 6-2/3 innings.
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Now look at the last 6 games after I had time to work with CW. He pitched 12 innings for us in those last 6 games. He missed a few games for basketball showcases. I fixed his stride and got his fingers on top of the ball. He was topping out at 75 by his last game with a filthy low 3)4 arm angle like Pedro Martinez had.
TV on the other hand started having arm soreness that he apparently battled the year before in his bicep. He only pitched 5 innings and became my first basemen.
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CW could legit go D1 or better if he drops everything and focuses on Baseball. He apparently might play at the lower college levels in basketball. And he'll be a 3 year starter at QB in high school.
TV is more likely to stick with baseball. But who's better? The better athlete. I proved it in 8 weeks and I don't know shìt compared to a top tier coach.
FYI. CW came out to long toss with me and a few kids in the fall and was chunking it 300' as an 8th grader. He could potentially get into the mid 90's if he works at it. He's only 5'11" 140 right now. His dad and older brother are 6'3 225 plus. I'm screaming at his dad to get him working more on baseball than he is. Because my thoughts are everything that made him great up to 13 ( being a wonderful all around athlete) is going to be a drawback. See kids like TV are puberting and hitting the weights and training baseball. By their senior year TV may throw mid 80's and know how to pitch. CW won't throw much harder and will not be able to locate.