The alternative to Market Garden is the one no one ever mentions.... WI Monty had rejected the MG plan and ordered the Canadian Army to clear the Scheldt Estuary imeadiatly, before the German 15th Army could complete its retreat into that area & set a defense? he could have caused all available resources to be used for that purpose. Worst case here is the Scheldt is not navigable until mid October, which is still a month earlier than as actually happened. Best case the Canadians catch the men of the Fifteenth Army on the move, round up anpther large bag of prisoners, advance further towards Breda, and have the approaches to Antwerp ready for the minesweepers and salvage crews in September. Either way having Antwerp open for business in early to mid October vs mid September easies the Allied supply crisis that much earlier and allows a larger scale attack in October/November than was possible then.