I don't know Don "Wink" Martindale. Never met him or anyone close to him. He could be a very nice man. Don Brown is a very nice man from many that know him well. Wink Martindale is 100% the wrong DC for the Michigan Wolverines. It was a terrible decision to bring him on and I mentioned this when he was hired. Pretty sure Michigan can't hire anymore "Don's" to run the defense.
These are the type of mistakes that could cost Sherrone his job. Wink was not wanted in the NFL, he had worn out his welcome at a number of organizations.