Two Chief Gods, coupled with a Valkyrie instructor, can be considered the strongest lineup the Valkyrie Corps can offer, best suited for a three-on-three match against the Norn Three Goddesses.
Witnessing a contest between masters will certainly be greatly beneficial to the combat level of those young Valkyries.
At the same time, this will also establish authority for him as the Commander, as well as pave the way for Scouty's upcoming promotion to deputy.
Moreover, this is also a good opportunity to call back Brynhild, who is currently being punished.
All in all, it's a triple win.
As for face and victory or defeat, that's even simpler.
Belldandy and Urd aren't as pushy as Scouty, and they won't care about winning or losing, having them face the two Chief Gods, Sif and Freya, in a symbolic friendly match.
Brynhild, however, needs to make a sacrifice and face the tough Scouty.