https://www.nbcsports.com/nfl/profootballtalk/rumor-mill/news/vikings-hire-keith-carter-as-assistant-offensive-line-coach
New assistant OL coach. Good. I wanted Chris Kuper replaced as I think that OL isn't just ineffective up the middle running the ball, but absolutely lost when they get out in space for screen and swing passes. The language O'Connell used about the new guy makes me think he also knows the current OL coach perhaps was lacking:
“I want to get stronger overall,” O’Connell said. “I love what Chris Kuper’s been able to do in that room, but I wanted to take the opportunity to get a former [head position coach] that’s been involved in some of the best rushing attacks over the past four, five, six years in football. I think he’s at a great time in his career where he really wanted to come to Minnesota, and I really think he’s going to be able to help us a lot, infuse some things into our run game.”
I think the 'but' says it all. And it sounds like the 'assistant' might be more title than a function. The new guy sounds like he has more experience and success than existing guy.