I'll put my money on Bandar. I suspect he returned to assume a significant role in the new government. If was being trashed, he would have stayed in New York.
I suspect the money was stashed by King Fahad as insurance and the new guys don't think it is neeeded.
They may have their own stashes and can bring this money home to put it to work. They wouldn't embarass Fahad by doing it while he was alive.
Bandar for next king.....