Simply to reuse the old River Country site. They are landlocked by the canal at Swam Trail to the east. The canal is part of the Water management district, and there are many restrictions.
They are just replicating the same model they used for the Island Tower at the Polynesian. Put the large ugly tower right next to existing facilities, and not dramatically expanding guest infrastructure. The made the Island Tower part of the existing DVC. Same thing at the Fort. Connecting LL with the new DVC Cabins into a single DVC.
Dave