You're right. Tommy Lasorda I think said that major league hitters could hit a .357 magnum fired from the centerfield bleachers. He meant that they can both time, and swing fast enough, to hit anybody. So, leading into your next point:
Right. Two things. One is that, when a hitter's in a groove, he sees the ball so well that he can hit both the fastball and the offspeed ball, equally well, perhaps driving the offspeed curve into the opposite field. Two, is that there's a speed, at which, most major league hitters cannot adjust fast enough to---it's about 88-89 mph. Above this speed, what the major league hitter cannot do, is sit on an inside or outside pitch, and protect against the opposite. If you're a righty, and you're looking for an outside fastball, if the pitcher comes in with an inside fastball, you can't get around fast enough to protect against that, so you strike out. That's the difference between 88 and 94, in essence. The hitters have to be both physically capable, and smart, above a certain speed.
Of course there are exceptions, one of which was Manny Ramirez, who could turn around on an inside 95+-mph fastball even when thinking outside curveball---he was a treat to watch, let me tell you.
You're right. Pedro had the best movement on any ball, AFAIK. His change-up was amazing to watch. It fell off the table, plus off the left-right plane. (It went both down and away from a lefty.)
Right, and the difference between 85 and 95 (or Nolan Ryan's 105) is like night and day.
Me moreso.
Except on top of that, I'm also dumb. 
