Re: Amazing consistency from the Red's rotation spots
I think a number of factors are helping pitchers.
First more power arm youngsters are staying healthy as sports medicine and the understanding of kinesiology of pitchers advances. Pitch counts...leverage stress...guys are avoiding injury that used to blow up before they hit the bigs. Read a out Gary Nolan's account of being a young phenom or Wayne Simpson's to really see the mind boggling abuses of the old approach.
Technology in film and computer analysis of mechanics. Young guys are far better coached and like Travieso...they are pampered and "fixed" mechanically before being tossed in the arena.
The technology you mentioned...analysis thru computer filming of zones and hitters tendencies. The old school book was handwritten notes from eyeball. Today its pitch type/zone specific analysis by computer db with pitch by pitch tracking and career sample sizes to verify it.
The cutter. Fairly novel fastball, a product of the new century and when thrown well almost unhittable. Luckily for hitters it is really difficult to throw a good cutter.
PEDs. I think they helped hitters more than pitchers. They help you recover faster but they don't add anything to your fastball, improve command or keep you from blowing out a shoulder or elbow.
Defensive advances. The same technology that helps pitchers is also helping defenses learn how to position for pitcher-hitter combos. Teams are once again valuing defense at the GG positions SS CF and catcher but even corner OF and IFs defense is being given more weight. Metrics keep advancing on the defensive side too. For instance a new study shows catchers ability to frame pitches may be far more important than anyone suspected in changing an ump's calls. Without extrene camera technology and computers that study would be impossible. Good defense makes any pitcher better. Good pitchers become great...average oitchers become good. I've watched a half century of baseball and todays average defender would likely have been a GG candidate in the last great pitching era, the 60s.