Summoners .... what will they summon?

[Onidemon]

we should get Bahamut bring summoner back to its roots glady exchange all the original primals for Bahamut

Bahamut is FF's most popular and one of the most powerful Summons, no way it will be a Summoner pet. It will probably not even going to be in game come 2.0. They will probably introduce him later in a expansion and i wouldn't be surprised if he wasn't summonable primal either.