Think @manikya_saiteja_gund has already done a great job laying out the basic thesis and answering your questions.
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If this is such a no brainer Why would a professional advisory firm not advise buying idfc?
Can’t speak for @voldemortdevil but there are enough savvy allocators who have bought into the story, recent examples I can remember are RJ buying 12mn shares as per this https://twitter.com/krunal39923264/status/1397438365696348160?s=19 and Banyan Capital presenting it as an idea at the Asian Investing Summit 2021 https://moiglobal.com/vp-rajesh-202104/, they had a great presentation on the idea.