No argument from me on Wright as the soul of the band. The way the piano work on Alan's Psychedelic Breakfast is just brilliant, but it's very simple (which is one of the reasons it's brilliant). A Keith Emerson would have destroyed the delicate balance of the song. I'm not a big fan of the pyrotechnics of Wakeman or Emerson (and consider them overestimated). In my own favorite progressive subgenre, Canterbury, there are three primary organists / pianists: David Sinclair (Caravan), Mike Ratledge (Soft Machine), and Dave Stewart (Egg, Hatfield and the North--not the Dave Stewart of the Eurythmics). All of them are at least as proficient as (and more innovative than) Wakeman and Emerson, but far less well known. Unlike flashier performers, their playing is secondary to the overall composition itself. The most unjustly Canterbury keyboardist, though, is Alan Gowen (Gilgamesh, National Health). He's probably the greatest keyboard improviser in any genre outside of jazz, but when he writes / plays a simple melody, the taste and restraint that Rick Wright embodied shine through. Here's an example, which says more in its brief 1:37 than any bloated prog epic: https://youtu.be/wPTrJ23hcy8

Thank you for this loving and informed tribute to a woefully neglected artist.