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Ironically, Market Garden was more undone by the German opposition that didn't exist, the illusory German tanks in the Reichswald that occupied the minds of the men who should have been taking the bridge at Nijmegen and pushing up the road to head off the scratch German forces heading the other way.
You are correct in that the diversion to the Groesbeek Heights, to secure the flank against the non thread from the Reichswald, was a major factor in the delay in capturing the Nijmegen bridge David.
This was another event where the commander of the actual troops wanted to get to the objective (the bridge) as quick as possible, to secure it. Like Urquhart at Arnhem, Gavin was over-ruled by Browning.
The first (and some say principal) error that jeopardised M-G was the escape of Von Zangen's 15 Army. However, M-G was in many ways a dead duck right from the inception. It went against the advice of the Dutch Military in England, who knew that the terrain in the Netherlands was totally unsuitable for this kind of operation.
And even if the bridge at Arnhem would have been captured and secured, that would have still left yet another major river to be crossed, the IJssel, which runs from just before Arnhem (Westervoort), due North to the IJsselmeer . This is a major obstacle, and indeed in 1940, when the Germans invaded Holland, this bridge at Westervoort was of such paramount importance, that the Germans captured it by dressing in Dutch Uniforms, to avoid the Dutch blowing it up as they approached. This never seems to be realised, but capturing the bridge at Arnhem would have achieved little more than liberation of the West of the Netherlands. Welcome as that would have been, M-G would not have 'opened up' the road into the Ruhr.
M-G was in many ways just a big ego trip, Montgomery feeling that he could single handedly go all the way to Berlin, before Christmas (not to mention wanting all the glory for just himself), and Browning, who was desperate to have his 'Major Airborne Operation' before the war would end. His decision to fly his headquarters in by glider on day one (giving himself his only actual 'combat landing' for his resume), depriving 1st Airborne Division of 56 (IIRC) desperately needed gliders for the first drop, was a selfish act which cost the 1st Airborne dear.
Henk