body position for Position B and C

[CO ump]

Originally Posted by bob jenkins

1) When the ball is hit, you might have to move right or left. It's harder to move to the right when you're already facing 1/2way left.

I agree, you lose maybe a half step.
How often is that crucial, relative to the steady stable look you get on all 1b pick off moves?

Realistically speaking
There are many, many umps with bad knees that don't move far or fast but are very good umps. I could spot most of those guys a full 1 or 2 steps and still beat them to a spot.
So taking a stance that gives you an advantage on pickoffs and puts you a 1/2 step behind when you need to move to the right is only an issue if you are not athletically able to recover that 1/2 step.
Does that make sense?

Originally Posted by bob jenkins

2) Perception.

Can't argue with that.