Paying CC deposit when booking through group dining?

[slinky101]

hi all, i have been told by a CM that i have to book through group dining for a party of ten for RFC@AK, does anyone know if I will have to pay a deposit (like at CRT or FDP) as we are a large group, have booked for the 10 of us for other places, coral reef, boma etc and we did not have to go through group dining, very confusing
Anyone got any experience of booking through group dining?