Never have a problem with cross contamination at chick-fil-a. Sometimes the grilled chicken can be a little overcooked. The gf bun is in a sealed wrapper to lower chance of cross contamination. Can use for the grilled chicken sandwiches. They also have a dedicated fryer for fries/hashbrowns, so you won't get cross contamination to those either.
— Gluten-free items are marked on the main menu
— Some
— Good