As the father of a customer of Kyle's who totally buys into what Kyle is teaching, I believe you can learn (and work) to throw harder. I also believe uninformed effort can be counter-productive, no matter how diligent or intense.
My son didn't get much coaching early because I thought I was raising a wrestler, not a baseball player. If I had to do it over again, I'd have invested in better coaching sooner.
Thank you. I have seen some of Kyle's videos on YouTube of Drivelinebaseball. I have seen them using weighted baseballs which is where I got the idea of. I am currently using a lifting program from a CC that I went and visited. I will also soon be hopefully going to a Sports Performance gym close to my home where they offer personal training, I believe the owner played baseball so he should know what he is doing.