You will never get a cabin lower than the category guarantee that you booked. I had two friends that had booked on Carnival and used the "Kelly Method" to find their cabin and were happy to find they had been assigned a Cat 11 suite. A few days later they looked again and found that they had been reassigned a Cat 9 cabin. That was the cabin they ended up with.
They had booked a Cat 8x guarantee.
__________________ Cruisemates Community Leader/Moderator
"There is a great difference between being well traveled and just having been to many places." ~Me