Wilder's plan was to play a narrow style with no out and out wingers. Done has been playing "wide" to try and provide goals, not crosses. Wilder wanted him to use his stamina and energy to get into the box and get on the end of things. Duffy was signed for his skill, creativity and clever play in and around the box, having shown a good ability to pick out targets in the box, despite not being a pacey hug-the-touchline-winger with outstanding pace. Scougall has been played wide for his ability to cut inside and pop up in pockets of space between the lines, creating things with movement and neat play, as well as being fit enough to get into the box and score goals, which he did today.
In Wilder's original formation crosses and width was to be provided by the full backs, and as these crosses would often come from deeper, there may be a slight advantage in them not coming from too wide, in addition to from deep, i.e. a narrow pitch may reduce the length required from the crosses, which could increase accuracy, possibly.
There are disadvantages as well, and opposition teams who scores first against us will no doubt be happy with a narrow pitch as they drop deeper to defend their lead. But the original plan probably didn't include the opposition scoring first too often...