I think the OPP position is bleak in terms of composition especially since Hayashi is such a special player in that she is one of the teams primary receiver too. The team is kind of a mess if she is off with the Koga-Inoue duo lol.
The next in-line are Wada and Nagaoka seems to be the biggest picks from the roster but they are not the greatest of defenders and barely used in the tournament. I do not if there are other options or maybe Kurugo's performance with Ageo (I heard they were already included in the long list) or have a Yamaguchi Mai situation. This season would be an interesting bench mark for sure. I just know Manabe is willing to make those unpopular opinion if he deem fit.
OT: China is a mess. Its looks like its gonna be SRB(3)-DOM(9)/TUR(1)-?/USA(2)-? with an African team and Six. That's 6 positions already. [JPN(8), BRA(4)],[ITA(5), POL(7) and NED(10)] still in the running. CHN(6) is practically a ranking qualification at this point. JPN's qualification is pretty much assured.