zm1283 wroteThe CCA has gone to this in the last year or two. The PU rotates to third even if the ball stays on the infield...
This is only true for one circumstance and only in 2-man. If the initial play is at 2nd base with R1 only and if R1 is safe and a throw goes to first base then the PU would have R1 at third. In this case, however, it is incredibly unlikely that there will be a RLI. I might even say impossible, but...
The reference is 2012 CCA manual pp. 65-66.
However, with a ground ball with no throw to second base the CCA manual p. 67 changes the responsibilities as follows:
PU: remains in the area of the plate to judge fair/foul and any interference possibilities between BR and the catcher. PU then moves toward the first-base line to observe potential running-lane interference. [italics added] PU communicates to U1 that he is remaining on the line.
U1: Has all plays at first, second or third base.