Pioneers of Islamic Banking

Among the names you post here is Maududi from Pakistan - not someone I would want to follow! Like Syed Qtub, he was profoundly anti-western, anti-democratic and misogynistic. His conservative and extremist followers routed the modernist Islamic scholar Fazlur Rahman out of Pakistan on grounds of apostasy. Rahman went on to have a distinguished academic career in Islamic studies at American Universities, mainly the University of Chicago. A great loss for Pakistan.
Another dubious character is Taqi Usmani. While clearly intelligent and scholarly, he had authored the barbaric hudud ordinances in Pakistan under Zia (since repealed I hope) and opposed the Women's Protection legislation there. While this is not directly relevant for financial issues, it does illustrate his extremely conservative orientation. I believe his impractical and unworkable Judgment on Interest was repealed a few years later. He was a sharia board member for banks (so must have been taking compensation) while a judge in Pakistan. His Davos paper
islamicfinancenews.files.wordpress.com/2010/01/taqiusmanipostcrisisreforms.pdf
is a good read to summarize his points of view.

You could add modernists such as Fazlur Rahman, Mamood El Gamal, and Abdullah Saeed to your list to balance the roll of conservatives, literalists, and traditionalists you have.