In a large mixing bowl, add the chicken, onion, garlic, parsley, lemon juice, salt, onion powder, smoked paprika, cayenne, 2 tablespoons of the buffalo sauce, mayo, and tapioca flour. Using your hands, mix the seasonings into the chicken until just combined. The mixture will seem a bit wet, but it will firm up. Allow to rest in the fridge for at least 15 minutes while you assemble the rest.