When we talk about flushing, especially the whole arm, people tend to over think pad placements. Generally the biggest muscles are going to be the biggest engines in moving fluids.
So a pitcher's standard set up, regardless of concern for rotator cuff or UCL, we should be hitting up the flexor, bicep, deltoid, trap. Occasionally a deltoid placement will switch down to the scap depending on general soreness of the individual pitcher.
Because of lymph node placements, the above described set up would be equally effective in clearing waste for forearm, upper arm, and shoulder.