Hearts have a very strong midfield and we'll struggle to compete with them, never mind outplay them. I can see the benefit of packing our midfield but as Weeyin says the danger is that Moult become isolated and we then resort to throwing high balls up to him when he's covered by 2 huge defenders. I also wonder how fit Pearo is - would he last 90 or even 80 minutes? Mark McGhee may also set us up to counteract Hearts and that would affect his line up. Still, its good to have options.