Sorry, I misremembered. it was Aretha Franklin which got much of his time during the early Spock's Beard days. The list of artists he recorded and toured with include: Phil Collins, David Foster, Debbie Gibson, Al Green, Eric Clapton, Steve Lukather, Neal Morse, Mike Portnoy, Lamont Dozier, Nichele Nichol, Natalie Cole, Jeff Porcaro, Richard Elliot, Roslyn Kind, Barry White, Simon Phillips, Chris Squire (Yes), Jennifer Holliday, Louis St. Louis, Kitaro, Jay Graydon, Sue Raney, James Ingram, Peabo Bryson, Original 5th Dimension, Aretha Franklin , Dionne Warwick, Aaron Neville, Marilyn McCoo, Melissa Manchester, Johnny Gill, Paul Gilbert, Eric Burdon of the Animals, Roberta Flack, Pointer Sisters, Brenda Russell, Glenn Hughes, Patti Austin, Smokey Robinson & the Miracles, Bobby Kimball, Sheena Easton, Eric Carmen, Teena Marie, Robbie Robertson, Richard Street (Temptation), and many more.
My point isn't that Neal isn't an amazing creative genius who can invent some incredible stuff, but Ryo is better trained, experienced, and can pretty play anything put in front of him. I noticed on a couple of Spock's Beard concert videos he really doesn't do much technically challenging, including some dumb "keyboard solos" which are similar to hack shit other great musicians have done when being spotlighted, such as Karen Carpenter, Chris Squire, and such. Rather than impress other musicians, they chose to just be exciting to laymen and only did silly gimmicks.