Wrong Tanaka said you can but it would take a lot of quest-chain to do it. I don't know if Yoshi-p going to do this but Tanaka said that later you be allow to learn from the beastman spell,ws,JA and even new stuff for DOH. So we could learn how to summon Ifrit from the beastman.

Don't read if you did not do Ifirit mission in ffxiv
Ifirt does ask you i'll help you but you can't ask the other avatars for help. This tell you that a class/job could learn how to summon them all later by asking for there help make a pack with them.