My headcanon about Michael Shelley and Gerard Keay’s gender is that Michael is very well-read on gender studies. He’s very well educated on the topic and if you asked him about his pronouns he’d go into a long conversation about his gender identify and what it means to him in specific.
Then if you ask Gerard his gender identity it would just be this conversation:
Jon: “And your pronouns are?”
Gerard: “Wherever the wind takes you.”
Jon:
Jon: “Would you like to elaborate?”
Gerard: “That’s all I’ve got.”