I got a nice piece of counsel from Joe Castleberry, as well as a good quote.
“Better to have one bad but tolerable boss than ten well-intentioned mentors.”
This points out a stark reality. At least when you are with a boss you are actually engaging your chosen field, whereas with mentors, much becomes theoretical, without much practice.
Better to be corrected by someone when you are engaging a particular field than to be corrected by someone while not engaging the field.