Quote Originally Posted by Mireille View Post
Yuna started with whm spells, but early on you could make her into a blm and retire Lulu completely. Of the FF games I have played, which is X +, only smn has been tied to whm in only one of them: X. In X the system allowed you to multi-class your characters starting around the time you left Luca. Pre-X I can't speak to.
FFX is a job-less FF, though not entirely irrelevant, the importance of that relationship is slightly diminished because, as you say, you can make anyone learn anything.

That said... The relationship between mage classes and summoner has been back and forth. In Final Fantasy Tactics, It's Black Mage > Time Mage > Summoner to unlock Summoner. FFTA is Elementalist > Summoner. FF9 Eiko and Garnet are White Mages but in FF4 Rydia has Black and White magic.

There's really no strict relationship between WHM and SMN or BLM and SMN. They could easily include a new class for Summoner to be linked out of. Arcanist? Oracle? Who knows.