Chris,
I admire all the research you're doing, but you should stick to the things you know the most about IMO. You're not gaining much steam with this last debate.
There are a few guys who throw a "natural" cutter, but sink and arm side run are the major fastball movements. And while "straight" might be the best for the arm, it's a killer to the career! There are many things that cause a baseball to rotate or spin in different ways... Grip, finger pressure, arm angle, etc... It's not always about supinating or pronating when it comes to the fastball.