The extensive holdings of the Corleone family were so diverse that, yes, many of the more sophisticated ones remained under Michael's control. When he tells Zasa that there are no percentages he is due, he is referring to street activity. As the decades evolved, the sophistication of Michael's investments increased whether legitimate or not. And, yes, Vinny summed up Michael's position when he told him that he was like the Supreme Court and that Zasa thought that Michael stood in his way of rising up in the Commission.