Ahhh...my favorite band is back!
To some of the above thoughts/questions:
Peter Green is TTBOMK still alive and making blues records (as is Jeremy Spencer, the slide guitarist who was in the original FM line-up). Bob Welch committed suicide not too long ago, which may explain the confusion. I also read of bad feelings re: Welch's omission from the RR Hall of Fame, but I'm not sure what the exact deal was.
Personally, I feel that BW's highpoint with FM was "Mystery To Me", to which he contributed the track Hypnotized, among others. I also agree that this middle period Mac, with Welch and Christine McVie writing most of the songs, was a great period for the band - tho I personally think she was the more important influence on the band's ultimate direction. Nonetheless, IMO Welch was certainly a significant figure in that band's history.
Danny Kirwan, who joined after Brunning departed/John McVie arrived was the band's third guitarist. Both Green and Spencer have had fairly serious mental issues, Kirwan is - I believe - presently homeless, and Welch, as noted, met a sad end. Lindsey Buckingham should proceed with caution, as life has not been kind to FM's guitar players.
BTW, per the above speculation, I also believe that Mick Fleetwood is the only cradle to present day member of FM. The band's original bassist (John McVie initially refused to leave John Mayall's Bluesbreakers to join FM, even tho Peter Green had named FM partially after him) was Bob Bruning who IIRC also died a few years ago.
Since I'll be there anyway, I'm hoping to catch opening night of the new tour next month in Minneapolis. I understand that there'll be new songs, including several from McVie, so I'm champing at the bit.