Skynyrd remains the best opening act the stones could have possibly had in my book. One rule don't go out on the tongue, hello, they went on the tongue.
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.