Maybe because he actually faced those two. Bill Slim fought against the Japanese in World War II. Slim was a genuine military genuius, Montgomery I would rate as ‘competent’. He wasn’t a complete fool, but his arrogance sometimes led him to make foolish mistakes.
Orde Wingate was also a military genius, if somewhat lower down the pecking order and slightly prone to madness and eccentricity.
Maybe, but he built his reputation on "brilliance" that came from broken German codes in North Africa.
His constant hesitation and slowness caused constant problems.
My late father served in the Burma campaign and become ill in mid 1945 and was sent to a British Military hospital in India to recover. He apparently did not have enough "points" to be immediately shipped home for muster out. While biding his time, he was attached to a British Army Unit in the Kashmir until he could ship out. He fully understood the term only mad dogs and Englishman go out in the noon day sun.