FWIW, and from the Hank Mobley group in FB, here's a napkin autographed by the members of Miles Davis' group at the Black Hawk in San Francisco on 26 June 1962, including Hank and J.J. Johnson:
Dex and Eric Alexander in the same thread... I was sure this would immediately light up the fire in this board...
Just my two (spontaneous and uninformed) cents: I like Eric's playing but could live without him, whereas I could not live without Dex!