Gin Blossoms after Doug Hopkins was booted. He wrote their only memorable songs. Sabbath after Dio left the first time and after he left the 2nd time. VH after DLR left and then again when Hagar left and Cherone replaced him (went from great to meh to awful) Squeeze after Jools Holland left the 2nd time (they made their best album East Side Story after he left the first time. Their sound missed him once he left for good after Frank). Deep Purple when Ian Gillan was booted out/left and replaced with Joe Lynn Turner. Foreigner after Lou Gramm left and Johnny Edwards replaced him on Unusual Heat. Bad Company when Rodgers left and Brian Howe took over. The Ted Nugent band after Derek St. Holmes left Judas Priest post Rob Halford. Ripper Owens couldn't cut it in the studio. Boston after Brad Delp died Crowded House after Paul Hester left and then again after Paul Hester died and they reunited without him. Neil Finn still wrote great songs but Hester's absence just can't be filled. The Who after Keith Moon.