I can't even fathom someone smacktalking old Summoner for Ruin Spam and then praising new Summoner's design. Oh boy I love both demi phases being 1 button spam fests and 90% of the rest of the rotation being Gemshine spam. It's just as bad as it ever was, except now there's nothing to manage.
As for this idea, you haven't actually explained what any of this is supposed to do. Summoner currently has a whole 1 free GCD in its cycle, so if any of these summons are gcd you've started knocking out the other things. If it's a demi summon that isn't tied to GCD you've now introduced even more nonsense about the shield being unusable while also making it extremely irrating to summon due to the long spawn/retreat animations where carbuncle is dead. Assuming none of that is true you're just throwing multiple summons on screen at the same time (because lmao what else is there to weave in the gem summon gcd) which is just going to look gaudy and needlessly busy.
Also Sophia is dual aspected Wind and Lightning so she could not be further from a Wind Aversion given the Affinity is Lightning. Aversion and Affinity itself doesn't really make sense with what you want Elder Summoning to be. Zodiark isn't 'against' anything, nor is thematically opposite to anything except Hydaelyn. If you want to tie these two together you'd be better off using Astral and Umbral variants of Fire, Earth, and Wind since those two represent the polarity of all elements rather than any kind of preference.
Odin also does not fit in with the big Z and H at all, and feels dramatically out of place. He's not even that special of a primal since it is just a creation of Eureka, and there are plenty of Eurekan primals.
Again, there needs to be more information or these ideas don't really amount to much beyond "isn't it cool???" What is the cooldown of Affinity/Aversion? Do they share one? If not the rotation is going to go beyond gaudy if you're vomiting out 9 primals every minute. Even if they don't share a cooldown the earliest you can pop this button is near the 1 minute mark, completely desynced from your opener and every possible raid buff/pot, since you need all 3 gem summons first. Either the potency is insane and you forgo nearly every gemshine in the first minute just to cycle faster (which would make it ridiculously op later when you can resync to raid buffs with any downtime), or it's just permanently mis-aligned with every buff by default unless you sit on it for a full minute.