Triumphant Second Bananas?

Are there tales of triumphant second bananas in rock? I know there are second bananas who've moved away from their original band to go onto success in their own right, such as Brian Eno, but are there second bananas who have triumphed and taken over the lead of the same band? There must be, but aside from possible situations like The Beach Boys, in which leader Brian Wilson had to set aside the reigns for any sibling brave enough to pick them up, I'm not coming up with a killer example of "triumph." Maybe the power plays I'm looking for were worked out in advance of the band making it in the first place. Do tell!