When mine was 12 he played two seasons, fall and spring and when they were both over he was glad to be onto something else, basketball, street hockey, bowling,etc.
My husband was pretty strict about it too, he felt that the specific muscles used in baseball needed rest.
I agree, 12 year olds do not need Sparq at this age and if it comes easy to him, does he really need all the other stuff. JMO.
Most kids that do it all very young don't usually burn out, they end up with injuries, be careful.