I have no idea but I have my own theory, that she hired Kindlmann just after that short time with Kiefer (who had to substitute Voltchkov) in IW.. and maybe because Kiefer couldn't stay anymore working with her he recommended Kindlmann. Just my thoughts.
BTW I'd really be curious about why she's not working with Mamiit anymore for clay, but I can't find any news...
OMG look what I just found googling.
it could be actually anyone because it's impossible to recognize them, but..