Hmmm... Not sure I agree with a lot of that. While the process of Indianisation had begun and was accelerating (with some Bn COs being Indian by 1941, as mentioned above and well-documented in Burma), there were still an awful lot of British Platoon Commanders in the Indian Army. They didn't suddenly get commissioned as Majors, so how else did they learn their trade?
At the nitty-gritty end of a peacetime army, let alone a wartime army, VCOs had extremely limited powers under the Indian Army's equivalent of the Army Act and King's Regulations, as they weren't classed as 'Officers Commanding', so each platoon ideally required a KCO to command it and to adjudicate disciplinary matters.