The important thing to remember is that a lot of the drills are exaggerated. That is the key word. When you watch a pro-hitter, the attack angle on a low pitch looks much steeper than the attack angle on a higher pitch.
Dustin Pedroia is swinging at a high pitch in this clip, but is still TTB.
Here are some examples of fastpitch players.
FP26, what frame or point of the sequence do you look and say "yep that hitter is beginning to ttb" ?
The barrel going backwards ?
Or is ttb being used as a way of separating those that push ? Hopefully everyone now knows that if the hands are being pulled by the obliques they're not being pushed.
When a hitter whips the barrel from the neck slot is that considered ttb ?
Since 99.**% have no idea what ttb is.. Are they all doing it naturally or is there some other actions or combination thats causing the barrel to be whipped ?