I had a random thought about all of this...
A lot of foreign players have or have had interpreters. I don't anyone other interpreter other than Ippei who was in the public eye so much. I have no idea what Matsui's or Ichiro's or Shiggy's interpreter looked like. It just sort of struck me how glued to the hip Ippei and Ohtani were, but that doesn't seem to be the case with others.