Okay,
So, I'm no expert on every last Imagineer...nor do I know a ton of things about the ones you've listed or even some of the greats...
What I would suggest, is getting a good book about Walt. Learn about the beginnings of the company and follow the story up to the creation of WED Enterprises. Some of the first Imagineers weren't theme park designers...they were animators and people who worked for the studio. I would learn about the earliest Imagineers like (these are just a FEW examples) Marc Davis, Yale Gracey, Rolly Crump (who wrote a seriously kickin' book recently!), X Atencio, John Hench, Bob Gurr, Claude Coats, Herbie Ryman, and several others...
Then work your way to Marty Sklar and Tony Baxter (we're transcending styles, time, and series of Imagineers)...learn about EPCOT and how it was put together and by whom...you'll start to see Joe Rhode appear a bit here with the Mexico and Norway pavilions...along with several others...
Then kinda learn about the Eisner years and the changes to how things were done...
Get past that and you get into Disney-MGM, Disney's Animal Kingdom, and then finally to today...you'll get to see where everyone has landed...though honestly, in my mind, Joe Rhode is one of the newer ones (in the grand scheme) who has crossed the line into being legendary himself...Animal Kingdom is like, that guy's mind open for tour! He's really awesome and seems very down to earth...one of my favorites as well...
Keep in mind too that Staggs, Rasulo, and even Lasseter are more execs than Imagineers in the purest sense of the word...they're busy watching the dollar...Magnum kinda straddles the line in that sense to me...Then there's Vaughn and the new guys...whom I probably know the least about...
Overall I have to agree with Lazyboy97o...it's a big subject matter and it will take you several books and some DVD's & Youtube to get it down pat...and keep in mind that the playing field is always changing...each generation of Imagineers brings something different and the challenges are of course, different as well...
Good Luck!