IMO floyd would not have worked without the input of both Roger, Dave and Rick as anything is in the end the sum of its parts. As I work in the NZ Pink Floyd Project I can tell you all as as fact that without the Keyboards Floyd simply can not work as so much rides on it. I play Daves parts but it is so based on what Rick was doing that you dont notice it untill you have to play "Money" or "Time" for example and see how much your feel for it is efected by the keys. Shine on is an obvious one but even here you can see how both rick and dave jam. In the floyd project we do the start of shine on as a free time'n and dont use a live click.. its really a freeing thing as you get to put your own mood to it as to how you feel on the night. Roger however is the master as far as ideas and lyrics go. But without dave to mellow him he can get very same same in his stuff and you get bland works such as the final cut that kind of feel like floyd but miss the mark as it is one side only of a force that only worked when at least two of the main three were on to it at the time.