So the fangraphs piece on Greene’s fastball (comparing to Spencer Strider’s), theorizes that Greene has a higher release point and less extension than Strider, which, along with less vertical action, make it more hittable. So, it seems as if there is a confluence of factors that negatively impact his heater. The obvious “fix” would be to get something off speed that tunnels with the fastball. That is so often the final frontier for a starter, and Greene is just starting the journey.