If they want their mix-pop concept how about:
1st part of the song focus on dance the 2nd part focus on vocals before finishing up with dance again. That way they make use of the other members with stronger vocal talents and not just waste it on this weird dance showcase in their MV.
That’s not a bad idea either. And it’s still a mix!
P.S.
...wasn’t Tank something like that? Dance, Vocals, Dance?