Here he is doing Warren's rig rundown. Warren plays all the time; if he's not out with the Allman Brothers, Phil Lesh, Gov't Mule, or a solo gig, he's sitting in with somebody somewhere. So Brian was working all the time as well. And Warren has great tone; and Brian would have been part of that. As you can tell from the video, Brian knew his stuff.
Thanks for posting the news.