Madcap Laughs is pretty good proof that Syd wound up being where he was supposed to be - Piper* on the other hand is consisted on the first true psychedelic records and Intesteller Overdive one of the early Floyd theme songs, while Astronomy Domine was played through out their career and See Emily Play was a charting hit 45, at least in England.
*Piper at the Gates of Dawn, is also a record by Van Morrison, (totally different material) the name comes from The Wind in the Willows.
/yes I have both records
//no, I never listen to Madcap, but PatGoD has aged very well.