I'd never heard of Mr. Coffin, so I looked him up; not an original (as I thought, those were Fleck, Levy, and the Wooten brothers). Coffin joined when Levy left '97, and left in '10 (Levy returned in '11).
But quite good, it turns out - as one would expect from someone sitting in with Sierra; thanks for hipping me to him!
Peter (who would never have thought to put "bluegrass and "soprano sax" together)