I don't fundamentally have an issue with a defensive bottom 6, but it only works if you are getting enough goals from the top 6/PP. They aren't. Instead of adjusting the strategy and trying to find more goals from the bottom 6, Sullivan has decided to bash his head against a wall.
Puusy, Poulin, Z, Hino, and Nylander should all be in before Harkins and White. Smith should be in over Ruhwedel. Whatever 'risk' there is in playing these guys doesn't matter. They need to find more goals and they need to find them now.