Chuck started off as a guitar player in Johnny Johnson's band in St Louis. Eventually he supplanted Johnny as the prime figure in the group, although Johnny continued to play with Chuck through the period of Chuck's biggest hits. Many would say that Chuck's distinctive approach to guitar was in fact based on Johnny's piano boogie licks, and later, after the two fellout, Johnson filed a suit alleging he was entitled to songwriting royalties. I believe the suit was dismissed because of the amount of time that had passed between the copywriting and the filing of the suit.
At any rate, Chuck reconciled with Johnny through Keith Richard's efforts, and appears in the band in the late 80s movie documenting Chucks 60th birthday concert at the Fox Theater in St Louis.