Keith Jarett isn't that popular under jazz people as he is under classical people.
Why? I am just suprised so see him mentioned again and again. If you read here he seems something special. If you talk with jazz people they probably only mention his name.
Most jazz people will tell you the four most important jazz pianists since the 1960s are McCoy Tyner, Herbie Hancock, Chick Corea, and Keith Jarrett.
You forgot to mention Patrick Moraz (The best european jazz pianist of the 70s)
Art Bleedin' Tatum you fools!