In this interview
http://ffxiv.gamerescape.com/2011/10...-is-out-there/

Actually it was kind of all put into one thing on that document but there are three different ways to think about this. There’s a buddy system for a companion and then you have a pet system and then the summons. The beast pet would be kind of like in FFXI, where you tame it, use it and then it’s done. So there is no growth with the pet. With Summoner, what we’re thinking of is maybe when you summon for example like Carbuncle… that’s not saying that Carbuncle is coming. It’s just an example! But when you summon it at maybe level 20 there will be certain abilities that it can use and then when the Summoner is level 50, that list will be extended with level 50 abilities. Carbuncle won’t change, it will just be the abilities that it can use. Then you get the buddy system which will be with your Chocobo and your Chocobo will be yours forever. It will have a level and it will power up and grow as you feed it and use it. So yeah there are those three systems. So the confusion there where pets can level up, that’s currently not the case. They’re just a one time thing. It’s Chocobos that will have the levels.
YoshiP says there will be a taming like a beastmaster, buddy system with chocobos fighting along side, Summoner's and then the Free company Primal summons

So like Ifrit would be a free company summon but something like Carbuncle would be from the Summoner class/job

Also this from http://forum.finalfantasy14.eu/viewt...hp?f=20&t=1993
You will be able to summon them after 2.0 but with this ff14 we are considering these traditional primals such as ifrit and leviathan like a god. So I want to separate the traditional summoning system from these new primals. You will be able to summon 1 primal per 1 world, such as 1 ifrit for 1 world. So there will be ifrit, garuda, and so on but only 1 each. So with this new system Im planning to implement, the free companies who have defeated the primal have the ability to summon them. In the previous series, someone could summon Ifrit as well as other people could summon Ifrit. So there would be serval ifrits in one world but I don’t want it to be like that, so people will have to fight each other to have the ability to summon ifrit.

If summons are not considered primals, they will be more common and more people will be able to summon them. We will add the summoner class which can summon carbuncle but theyre different from primals. So primals can only be summons by free companies.
Thats what Molly is saying... they're going to be separate entities...
Free company summons doesn't mean there wont be a summoner class/job