The 'Sweeper Keeper' came to deserved acclaim at the 2014 World Cup, when Manuel Neuer showcased his ability to rush out of his goal, and "sweep" in behind Germany's high-line, almost playing like another centre-back out of possession. Since then, the role of the sweeper keeper has only grown and evolved, becoming a player who is capable in build-up phases, ventures out of their goal to involve themselves in passing sequences higher up the pitch, and completely commands their penalty area by coming off their line and taking control of any situation.
The main task of any manager in the modern tactical era is to implement a tactical system and style of play that simultaneously suits their own taste, while getting the best out of their best players, if not the entire squad. Marco Rose has rarely accomplished that feat this season, and would be wise to stick with the back-three in the future. Here is why Dortmund should persist with the 3-4-2-1 in the future, following their 6-0 win over Gladbach on Matchday 23.