Mechanics question

[bossman72]

In 2 man mechanics, why are we in the C position with bases loaded or runners at 2nd and 3rd or runner on 3rd only?

Our chapter goes by CCA mechanics, and I'm trying to enforce "doing what the book says" to promote consistency within the chapter, but the old timers do have some good points and I really can't justify why we are in the C position for those plays.

Their argument is that they can see the pickoff at third fine from the C position and are in better position for a double play from B since the ball rarely gets thrown to third.

I like to know the "why" of our mechanics and not tell the guys "we do it because the book says to do it this way". So, can you guys help me with the justification of putting the BU in C for those situations?

Thanks!