Guns N' Roses
Missing Members: Drummer Steven Adler and guitarist Izzy Stradlin, 2016 to the present.
Background: After eight years of hibernation, Axl Roses took Guns N' Roses back on tour in 2001 without a single other original member of the band. Izzy Stradlin made surprise guest appearances a handful of times and Duff McKagan even filled in for Tommy Stinson briefly in 2014, but Axl always said that a reunion with Slash was an absolute non-starter. In 2016, however, he shocked the world by bringing Slash and Duff back into the fold for the Not in This Lifetime tour, which is still going two years later. Izzy didn't participate, he claims, because they wouldn't agree to split the money evenly. Adler was sidelined due to a medical ailment and a shaky relationship with Axl, but he did briefly guest at five shows.
Impact on Reunion: Even with just three fifths of the classic lineup on the stage, Guns R' Roses were able to headline stadiums all across the globe and rake in ridiculous amounts of money. Old school fans may have grumbled, but they still bought tickets. But would they have sold at least a few more tickets had they been 100 percent? Probably.
Odds of a True Reunion: Hard to say. Steven Adler would come back tomorrow if given the chance, though his ability to play three-hour shows night after night is somewhat of an open question. Izzy Stradlin is among the most mysterious figures in the world of rock and he hasn't been on a real tour since 1991. If the cash were right, however, he might be willing to suck it up for the "Izzy's Back: Give Us Even More of Your Money Tour."