I voted for Sabor A Mi as well.
They're both fair; however, in the later BMB photos, to me Mel appears much younger and he has a full head of hair; so, I don't think it's Mel.The guy in the center next to Frank looks like he may be the guy at the right on the front cover... and he may actually be Mel Pollan in both photos
My thoughts are that group membership still had not yet been solidified. Also, I think the two unknowns on the front cover are different musicians than the unknowns in the two promo photos. The only thing I'm sure of is that the rear cover photo and the first promo photo are the same musicians.Here's something I never noticed... the liner notes say there are NINE musicians in the band, but a head count of the front cover only shows eight guys, and that's counting the one "taking care of business" in the back row. There are indeed nine guys on the back cover, so I wonder if one or two players were just not available that day?
In the lower photo between both Franks? Yes, based on a couple internet photos just perused, I would say that's a good match.I think Lew McReary is next to Frank