I found something that looks like Bobby Hunt's old website at
http://archive.is/90Tu
On it it says
Upon returning to Los Angeles Bobby was invited by Bob Welch
to work with Fleetwood Mac. Following these tours Bobby
resumed working with his organ trio. so "work with" would appear to not be a claim for membership.
I haven't found anything out about any recent activities from Bobby as the site is now defunct, but I've emailed him, just to ask if he has any memories from that time that he may care to share with us. It's worth a try. I'll let you know if anything transpires.