There is one thing WOWY won't tell you. For example this:
Guentzel - Crosby - Kessel: 33 TOI, 2 - 5 GF-GA, 75 ZSR
Guentzel - Malkin - Kessel: 89 TOI, 6 - 7 GF-GA, 79 ZSR
Guentzel - Sheahan - Kessel: 116 TOI, 5 - 6 GF-GA, 48 ZSR
That winger combo does not work with any center, not only Sheahan. And then there is rest of Sheahan WOWY with them:
w Guentzel: 42 TOI, 0 - 0 GF-GA, 27 ZSR (52.6 CF% though)
w Kessel: 38 TOI, 1 - 4 GF-GA, 31 ZSR
That 1 - 4 may look terrifying but I would reserve my judgement until I see how they perform while not having such a heavy defensive starts.