Aston Villa and Unai Emery endured a pretty difficult pre-season ahead of the team’s return to the Champions League. Yes, many will tell you that pre-season is all about the players building up their fitness, or in the case of new players, trying to feel at home. But Aston Villa’s defeat to Borussia Dortmund on Saturday was their fourth loss this summer, with many players struggling and very few putting themselves in the good books. Pau Torres’ form for Aston Villa is worrying, Youri Tielemans is looking strong in midfield and Morgan Rogers was the standout attacker. Emery could save Villa mil…