tommy flanagan is one of the under appreciated greats. understated style, and while not being closely associated with any particular post bebop style or star ensemble contributes to the under appreciation, he was part of the watershed session in post bebop, Giant Steps of course. really a gentle, kind soul as well, once had lunch with him with a very small party.
have listened to 1000's more hours of jazz piano than euro-american 'classical', and to generalize, almost every pianist in jazz post 1960 who's gained any commercial visibility plays derivatively to varying degrees under the influences of Powell, Monk, Evans. much of what gets transmitted in the jazz conservatories like Berklee comes from those sources. most players with training do not sound like Cecil Taylor or Don Pullen, who found a bit more of their own personal way on the instrument. powell, monk, evans of course have influences that go back further (to Ellington and Tatum for example, each in their manner the apotheosis of swing piano), but unless a pianist sticks to a more discrete (readily discernible) style of swing, stride, blues/boogie, new age/world, New Orleans, (s)he plays their musics.
nearly all of the great 'classical' composers for the piano other than Schubert were piano virtuosi. of the present classical virtuosi, doubtful if many will be canonical composers to the same degree as Saint Saens, Albeniz,Villa Lobos, Ravel, Rachmaninov, Debussy, Prokofiev, Bartok, for an abbreviated menu of just 20th century players. from the trinity of bebop and after titans, Monk stands alone in stature as a canonical composer.