I was trying to go through strategies that involve a full team. CounterCoat is basically a one-man-show because you can only use one Focus Sash. I did integrate the idea into the strategies (Sash-Counter Gengar).
In Gen V you could use Sturdy as a Focus Sash but there are none that learn both Counter and Mirror Coat. Having said that, Metal Burst + Sturdy may be viable on things like Aggron and Bastiodon when combined with a Sash CounterCoat Pokémon. This would only be in Gen V though, I haven't updated the guide for Gen V yet.