Concurring bump.
When you consider how primitive the Mississippi Gulf Coast was in the eighteenth century during the height of the international slave trade, and that the United States outlawed the practice in 1808 a scant five years after aquiring the territory, the fact that so few slaves 'disembarked' at the Gulf Coast is by itself unremarkable. We also know that between 1820 - 1860 close to 60% of the slaves in the upper South were sold at auction to the deep South.