When I saw the group in 1994 the lineup was Denny Doherty, Scott McKenzie, Lisa Brescia and Deb Lyons.
Doherty was standing in for John Phillips who had just had his liver transplant.
I actually saw that version of the Mamas and the Papas at the Saratoga Performing Arts Center. I'd forgotten that Spanky was a member then. On the same bill were
a bunch of musicians performing as Fleetwood Mac, and as I recall, none of them was a member of the 70s version of the band. Perplexing but reasonably good versions of both bands.