For what? She's not adding to the team's potential score anywhere (she can't even beat Zhang Yihan on floor anymore) and they can't afford to the leave the higher scoring vaults at home.
If you’re bringing someone just to vault, Du Siyu’s DTY gets bigger air.
China needs hit routines on every event more than they need the tenths on vault though. Last year they had 3 low vaults. They had all hit routines counting in Prelims and finished 3rd. They counted two falls in TF and lost the bronze by .9 tenths. Just one less fall would have had them over France. Replicating their 165.663 from Prelims would have had them in silver over Brazil!
That was with using 4.4, 4.4, 4.2 VTs. This year they will have Zhang Yihan's DTT, that vault alone upgrades the total. The most important thing is NOT FALLING on the other events.
It would be nice if this was Worlds, they could bring both OYS and ZQY and just decide after podium training who to make alternate based on who's hitting then. The decision has to be made now though, and OYS is who is hitting now. Zhang Qingying almost killed herself on UB yesterday, fell on BB, and isn't usable on FX. She's only still in the conversation because she recovered her rudi. This news clip shows better how they landed the vaults, she barely got it to her feet:
Zhang Qingying's UB
My team is Qiu Qiyuan, Zhou Yaqin, Zhang Yihan, Ou Yushan, Luo Huan. I'd love a big VT rotation, but I don't take risks, I want the stability. Even this team is riskier than I'd like.