Offenses that concentrate on a Power Running attack just don't work. This is an out dated idea that may have worked a few decades ago, but doesn't work in today's NFL.
Just look at the best teams this season. Colts, Saints, Broncos, Steelers, Patriots, Vikings...etc. They all have good to great passing attacks. You can't just run against today's defenses at will. Today's LB's and DL's are way to fast and strong for an offense to just impose a running attack on them. Offenses need to be able to spread the defenses out to have an effective running attack. No team can run consistently against 8 and 9 in the box.
Sing needs to realize this real fast, and hopefully adjust his philosophy with Alex at the helm, other wise he will be another coaching casualty at the end of this season.