I am having a hard time finding online the specific reasons why he was cut in his sophomore year. The only hint is that at the time, Jordan was around 5’10" or so. He grew to 6’2" before junior year tryouts, and three more inches before graduating high school. Jordan may just have been physically immature as a high school sophomore – not so much in height, but in coordination, strength, raw basketball skill, etc.
Well, yeah, that was pretty much it. A high school sophomore has to be pretty damn good to make the varsity, and Jordan just wasn’t there yet. As the articles briefly discuss, baseball had been his preferred sport, and he hadn’t spent enough time on the court to perfect the skills we saw later in his life.