STORMBLOOD SPOILERS
Well, the powerful primal has been destroyed, so it isn't the same Shinryu from the Rift. However, the suggested Shinryu FATE can still go on, since this would be against the Rift one. As for Omega... we will see... Also, this suggested add-on would be a good tribute and ending to Nael van Darnus, since I felt dissapointing seeing how Zenos yae Galvus was a Nael rip-off. At least, this can explain more about Nael's purificaction. Not just Eorzea and its primals, but the entre world, including Garlemald and its new ways to modify Garlean genoma. Nael wanted to purify everything.