Ishii? what are you talking about? Do you mean Sakoda?
Pipes are completely unreliable this time especially if they're heavily relying on Koga. Have you ever seen Koga land a perfectly deadly pipe against Brazil, Italy, Poland etc. back to back? no. She will never be Gabi. Her serve gets wonky after 1 strong serve what more with pipes.
They should go for their middles. Pipes will just tire the OHs faster and by OH I mean Koga.
IIRC Sakoda retired right after the Olympic Qualifying Tournament so OH duo in Rio was Koga and Saori