Zero over indexing. I'm not just using walk rate and certainly not from 50 innings. In his minor league career, McDougal has walked 4.9 batters per nine. Additionally, 37% of the pitches McDougal threw last year were balls. In the MLB, that would rank McDougal in the bottom 10% of starters. When you take into account his high chase rate, you realize he's throwing even more balls. MLB batters will chase less, meaning you're looking at a ball rate near 39%-40% which is in league leading territory.
Throwing balls doesn't necessarily mean youre bad, but more of them than not live on the edge of the zone but those with plus stuff who throw balls can still succeed. It just usually takes time and doesn't occur immediately, and they struggle getting deep into games to start their careers. Hunter Brown is a pretty good example for you to look at in context. I am absolutely higher than most public models, but I've had some pretty good success in the pitching forecasting sphere so I don't really anchor off anything else.
Editing: Just to add that Brown had better zone command, but was erratic and threw a lot of pitches because of his high ball count. I don't think Tanner McDougal is going to be Hunter Brown --- who is awesome.