I do not have time to respond to your shallow arguments but I to let you know how much information you are missing I will say a little bit: 1) Mufti Taqi Usmani said more research is needed in the book Introduction to Islamic Finance. This was one of his earlier works and does not have the full research - agreed. However his opinions on this matter were finalized over time and he chaired the AAOIFI board, and the his opinions have now been formalized with conditions for the permissibility of investing in stocks. So Mufti Ebrahim Desai saheb cannot quote him on that. Moulana Taha Karaan told a ulema gathering in Toronto not to rely heavily on Islamic Finance book because this was his earlier book. Many ulema have given their final opinions that it is permissible.