Here is the story as I understand it.
Santana had some hits with Black Magic Woman, Oye Coma Va etc. About the time of Caravanserai Carlos started to hang around with John Mclaughlin who was like "Carlos, Miles Davis is THE MAN!"
He was right, you know.
So Carlos is diggin on Miles and getting all down with his Scientology self while Rolle and Perry were like "Man, we want some hits and stuff"
The fact that there are only like three tracks with vocals on Caranvanserai was the writing on the wall.
Journey went on to make the hits, Carlos went on to make MUSIC.

Caravanserai is like no other Santana album, probably my favorite. If in fact the MoFi SACD is the real thing and gets released I can't recommend it highly enough.
Um, back to sort of on topic, a great recording to check out a system.