While thinking about this topic, I wonder if it boils down to a over generalized way of thinking. This goes for all levels of baseball and even pro. Seems that the overall thought process is pure velo can't be taught. Kind of like height in basketball, you either have it or you don't. Command takes a back seat to what stands out. I ask you to think about what seems to look better when a pitcher has a bad day (after all everyone has one) - Mid 80's getting teed off on, or a Mid 90's walk-athon? On the surface, nobody put the ball in play during the walk-athon, so the nature of thought is "What if he only threw strikes?". Ultimately the reason 90+ comes into play is that this kid has something the other kid will likely never have. Recruiters/scouts view this as a theoretical "ace up your sleeve". They believe that once their coaches can get a hold of this kid, he can be taught command and secondary stuff. Played quite a bit of baseball and after all, it's dam near impossible to respect 90+ then adjust to Slider/CB speed differential. You can't be sitting soft and adjust to fast, your brain don't work that way.Then if you can control a quality CU - good luck - might need to start banging on some trash cans to have a chance 
This is why coaches say when the guy isn't throwing hard sit CU. It works because you don't have to fear getting blown away.
