Do you really think its as simple as that @Napper ? I like to think there was coaching involved, with a good balance between attack and defence. The goals conceded was an issue under RDZ last season too.
Aside from tactics, I think RDZ' style of play requires an amazing shot-stopping...
Potter eventually found the balance, his last 15 games saw 16 goals conceded and 7 clean sheets. Yep, he had Caicedo, Mac Allister and Bissouma available for much of that, but more fundamentally he had managed to solved the issue of us conceding goals on the break, of defenders chasing the ball...