I saw that same show in Ft. Worth, TX in 1972, which included the Staple Singers as the middle act, and agree completely about Stevie Wonder (who was being billed as "Stevie Wonder" for the first time rather than "Little Stevie Wonder") The Stones and the Staple Singers were great but Stevie Wonder stole the show.
Opening Acts For the Rolling Stones
One of the things I always admired about the band was their choices of opening acts. I speculate that early in their careers they may not have had much input, but starting around 1969 things changed. Here's a link to a website that actually lists every opening act since July 12, 1962 (Long John Baldry). I could be wrong, but I think Buddy Guy has done it the most.