Another thought I had that would mean totally changing how Summoner works would be if it was changed into a Tank role, and instead of summoning forth a separate Egi the Summoner would actually call forth the Primal Aether into their body and become a vessel for it. A lot like Iceheart and Shiva. The Summoner would then take on the appearance of the Primal Aether they called into their body. So if they summoned Ifrit they would gain his horns, claws and tail. Or if they called forth Garuda into their body they would gain her wings and hooves. As well as tanking abilities based on that Primal's element.