I was reading this answer when I came across a quote about Rey learning about Chewbacca:
I'd heard of Chewbacca from some Wookiee traders who'd stopped off at Jakku. They said he was an amazing hyperspace scout and smart smuggler, with a reckless human first mate who was always getting him in trouble. I never dreamed I'd get to meet them.
The bold text is what caught my eye. Does Chewbacca tell Wookiees that he is the captain and Han is the first mate, do the Wookiees just assume Chewbacca would be the leader because Chewbacca is legendary, or are these traders just building up the legend of Chewbacca despite what they know is true?