Correct. As has been discussed before, the on board rebooking OBC & 10% offer off is booked using a booking code. You can only have one code (or "offer") per reservation, whether it be the on board booking, Kids Sail Free, FL resident rate, military rate, etc. Disney Visa uses another code, & u can't use two.
There USED to be a $25 credit given by
DCL for booking online (not matter who booked it- yourself or your TA). That did not require a booking code, but instead, it was an offer from DCL, & it was combinable with the Disney Visa $50 OBC.
You can combine OBC given by TAs with anything, as again, no code is used - its simply money given to clients from their commission.
The only way you can get the $50 Disney Visa OBC is by booking a rack rate stateroom & by using it to pay for your deposit & balance. I cannot speak about the *GT rates, as I do not have experience with them & do not want to answer incorrectly or assume.
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