Philip Larkin? Jim Godbolt?
For me - I guess Chick Corea comes in to this category. After the first ECM Return To Forever LP. Having said that, I've enjoyed him live in the times I've seen him over the years but the CDs/LPs have left me a bit cold..
Also Blue Mitchell after 'Boss Horn' (although 'Mapenzi' was a return to form).
Re Blue Mitchell, Stablemates of 1977 is a good one, though an inspired Victor Feldman is an added attraction.