I went with my son to that show in Anaheim, he was 17 at the time. Going into the show he was a big Bob fan, but could have cared less about Van (I play Van daily and the kids got tired of him).
Half way through Van's set he turned to me and said, "Man, his band is really tight". After that he became a Van fan and even bought on his own some CD's of his.
I went with a gaggle of gals that liked Van but were not Dylan fans. They were highly impressed by both, I'm glad to report!