Aston Villa's Goal Difference in the Preseason

Aston Villa has gone from a negative goal difference to a positive goal difference in the time since. The argument for Aston Villa, and this is where it is an XG story, is that what happened is they changed from Gerard to Unai Emery. So yes, the fact that their goal difference is only positive for or whatever is true, but it doesn't reflect what this team is.