If Montgomery wasn't commanding the 21st Army Group? Montgomery was always advocating for a single, narrow thrust straight to Berlin. The fallacy of it was proven in Market Garden. Hard to move supplies, needed material (pontoons), equipment forward on a narrow thrust. Additionally, the terrain in Northern Germany was no as favorable to tank warfare as was other parts of Germany. While Monty was carefully planning his Rhine River crossing, the 9th Armored captured Remagen. Then Patton crosses too. Monty was still planning. Monty had boasted that he would capture Caen on D-Day. That didn't happen and it took a long time before it was. Then he failed to close the Falaise Gap. Admittedly he was up against 5 panzer divisions, but he had overwhelming air superiority in his favor. I would have sacked Monty and asked for Alexander to lead in his place.