SJM spent 4 books brewing and building a connection between Azriel and Elain.
I think Azriel’s pov introducing Gwyn as a love interest is meant to give SJM space to get creative and to toy with our feelings mostly.
Though I can expect anything from her. And failed relationships before “it works” is a classic J Maas thing.
I personally believe in Feyre’s artful prophecies : like when she painted stars night in her cottage, like when she had the painting image representing Nesta and Cassian. I think the light and darkness painting of Azriel and Elain will come true too. We shall see.
Gwyn could be his amazing friend with whom Azriel will have a special bond and will become BFF like Nesta did with the new girls ! Who knows ?