He ascended quickly to the majors, had an amazing arm, was unspectacular in his initial tastes of the majors and because of the off-the-field problems, he was relegated to being a bullpen swingman. AL Cy Young winner Zack Greinke Their situations are different, though. Greinke's SAD was keeping him from pitching effectively at all, not really impacting his stamina. Greinke was ineffective because his mental problem wouldn't allow him to fully utilize his physical gifts. Morrow, on the other hand, has been able to utilize his best stuff & velocity (unlike Greinke). These are really two entirely different situations imo, aside from both being unique health problems. SI story on Greinke You can even check Greinke's avg. FB velocities here, and Morrow's here, just as some support for what I'm saying.