You're a piece of work Jaime! Funny stuff!
It appears to me that Richard Wilson's contributions spans into the part of Orson's career when he was having difficulty in Hollywood. It is hard to judge his contribution because it is not easy to separate his efforts from Orson's. Richard Wilson might have been his radio producer, but as the story of the War of the Worlds show reveals, Orson shaped the end product.
Houseman was gone by 1942 and that is the year Welles developed the reputation that followed him the rest of his life. From everything that I have read, Houseman freed Welles from the business, coorespondance, and organizational aspects of the Mercury, allowing Orson to concentrate his creativity on production.
It is truly a shame that the Welles/Houseman Mercury team disbanded. I believe that John Houseman might have been able to buffer and calm the chaos of Ambersons/It's All True/New RKO execs for Orson, thus changing the course of Welles' career.