WINDURST MISSION SPOILERS FOLLOW. DO NOT READ IF YOU DON'T (WANT TO) KNOW.
Karaha-Baruha's Animastery is unrelated to the Summoner job, the practice of which actually originates in the Far East. Karaha-Baruha sought to go beyond the simple act of summoning as practiced by those who have been granted that power by the avatars- what he wished to do was actually control and dominate the avatars themselves, against their will if necessary, something he called "complete summoning". Rather than simply call fourth a mere fragment of Fenrir's power, he called the real Fenrir himself. So don't count on him giving you any tips relevant to your job