Well YTeen song is called Do Better, Jooheon, IM & EXY wrote it.
If it goes as the picture shown from WJSN: Eunseo, Cheng Xiao, Seola, Soobin, Dayoung, Exy & Yeoreum + All the Monsta X.
I find it pretty much well balanced for WJSN:
Vocal Line: Seola, Soobin and Dayoung
Dance Line: Cheng Xiao, Eunseo and Yeoreum
Plus Rap Line: Exy
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Oh and MNET confirmed that they are in talk of a season3 of Produce 101 which will be with girls again, so I guess it would One season of girls and one season of boys. Let's make it a 2 year contract and the rotational thing like Hitori said can work.