I know what you mean. Even though I'm not a Syd fan I've often wondered that myself, and just how different the band would've been in general. Especially if Syd wasn't schizophrenic and the band never hired David. Or if the five man Floyd actually worked out either with Syd taking an active role or being a sort of Brian Wilson figure. Obviously it woulda been a hell of a lot different. Especially lyrically imo. It's also intrigued me how what happened to Syd closely mirrors yet at the same time differs from what happened to Fleetwood Mac's original guitarist Peter Green (who truely was an acid casulty imo). Who funnily enough David sites as a pretty big influence guitar playing-wise.