Strange mixture of WB points. The man with the plaid hat looks best to me. I wonder how the D500 might have solved this... one of the really big differences in the new generation...
It's not something of WB points, Frank. The man is standing in a yellowish light, and the lens and sensor captured it as it was. It is a mix of different light. The point here is the post-processing.
It was quit dark, and for a 300mm the shutter speed goes up, took some risk with 1/200, hence an increase in ISO to 720. Every increase from base ISO limits to a certain extent the post-processing possibilities.
For this picture, I did some framing to focus on the people behind the stall as I wanted to emphasize, the eagerness (or perhaps hurry) to pay, or to do the purchase quickly. So I wanted all neutral visible in the image, meaning the man in the yellow spotlight, decrease in lightness, and the others a slight decrease of the shadow.
Many ways are possible to post-process it. On Flickr I uploaded a natural version in the originale frame which reflects the cold morning atmosphere in a different way.
https://www.flickr.com/photos/fisherking/32145379850/in/dateposted-public/