David,
How do you figure to be "just as close" from B on a steal of third? From C, I can tell when the runner is going. I peek over my right shoulder, as I was taught. I'm only going to get 3 or 4 steps at best, on an angle in and toward the line. But I end up about 20 feet from 3rd. From B, you are still only going to get a few steps, and be 50+ feet from the play. That isn't just as close.
I have never heard of the mechanic for 2nd base only in B. I have never seen anyone position themselves in B with 2nd base only.
There were a few umpires back around 1990 in my association who tried to get everybody to use B with runners at 1st and 2nd, and that went over like a lead balloon. That idea was quickly scrapped, and I haven't heard of it since.
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