The gluten-mushroom-eggplant breakdown:

Alex: can't eat gluten, wants both mushroom and eggplant
Steph: can eat gluten, wants both mushroom and eggplant
Azz: can eat gluten, wants mushroom, can't eat eggplant
Silver: can eat gluten, doesn't like mushroom but can deal, meh on eggplant

So it makes sense to do the gluten free with mushroom and eggplant, gluten yes with mushroom only on the idea that Silver can deal