A source told CBS Sports that J.J. McCarthy was seen as "unpredictable" within the Minnesota Vikings, factoring into the quick decision to name Kyler Murray starter.
https://www.foxnews.com/sports/jj-mccarthy-considered-unpredictable-vikings-hand-starting-qb-role-kyler-murray-report
https://www.foxnews.com/sports/jj-mccarthy-considered-unpredictable-vikings-hand-starting-qb-role-kyler-murray-report