Sounds like the big fella had a classic case of the "Hey coach my arm feels fine don't let me miss my turn in the rotation-itis".
Is being a High School hero worth the loss of your future? Big dummy..... If you need to miss 1, 2, or even 3 starts you need to make sure your arm is rehab-ed ALL THE WAY! You have the size, desire and velocity to go further Tanner, show some discipline and think "big picture and long term".