I was reading about Hernando de Soto and saw William Powell's painting (Relevant bit cropped and added below):

The odd thing (Marked with a red arrow) is the man who looks Moorish and is dressed in Moorish Military attire unlike the other people in the party. Of course the painting was created some 300 years after Hernando died so it can hardly be considered historical evidence. Not to mention, it is unlikely that the Spanish would have allowed the converted Andalusians to dress in that fashion. But that made me think if there were any Moors (That is, the Conquered people of Muslim Al-Andalus) who accompanied him in his expeditions.

I have looked about (Perhaps not that well, American history is not my forte) but all the mentions of Hernando and Moors that I have found are in context of his upbringing and the downfall of Muslim Andalusia in 1492, eight years before he was born or the Moors that came with other Conquistadors.

So my question is, did any Moors accompany Hernando de Soto (specifically him, not any other Conquistadors)? If not, why did the painter William H. Powell paint a Moor there?