I just can't agree with "that were much higher class and caliber than the band they used to play" for John Paul Jones, Gary Brooker or George Harrison. They all did interesting work after their group efforts, but it wasn't of a different caliber, at least IMO. The recordings of LZ, Procol Harum and the Beatles are hard to beat.
Along those line I would offer Robbie Robertson's solo catalog as at the same level of his work with The Band.
Neil Young's solo output is certainly far larger than his work with Steve Stills in Buffalo Springfield and CSN&Y, but it's at least equal in quality.
Richard Thompson's solo career is equal to his work in Fairport Convention.
Ditto Dave Alvin vs. The Blasters.
Along those line I would offer Robbie Robertson's solo catalog as at the same level of his work with The Band.
Neil Young's solo output is certainly far larger than his work with Steve Stills in Buffalo Springfield and CSN&Y, but it's at least equal in quality.
Richard Thompson's solo career is equal to his work in Fairport Convention.
Ditto Dave Alvin vs. The Blasters.