I am not related to the Howards at all.
According to what I've found, Hardy Howard was the only Howard in Union Parish in 1850. Did he come to LA as a young man, or would he have come as a child? That we don't know. The 1840 Union Parish census has 5 Howard listings: Andrew, Briges, Henry, James and Robert. I don't know if any were from Alabama. But, only two, Andrew and Briges had young boys in 1840. Andrew had two between the ages of 5 & 10. Briges had one under 5 and two between the ages of 5 & 10. According to the four census records for Hardy Howard, he was born ca 1825, 1827, 1828 or 1830. He could have fit into the ages listed above if he was born in 1830.
Not having a county in Alabama makes it difficult to research there.
Hope this helps.