If you could trade out one Eikon from FF16 with a any other summon, what would you chose and why?

I think we could easily lose Odin since we don't even fight him properly.
And replace him with Byblos.

He premiered in FFV's Library as an antagonist to Ifrit. There's just a dozen ways to make him work in FF16.

I don't have anything against Titan. But you could replace him with Alexander and it probably wouldn't change much. Maybe just the opening fight with Shiva.

Combine Garuda and Ramuh into Quezacotl