With the surprise announcement Friday that he had parted ways with defensive coordinator Don “Wink” Martindale, Ravens coach John Harbaugh created a major hole in his staff. Harbaugh has always hired from within when choosing his next coordinator, but he could also look to familiar faces outside the organization. Here’s an early look at potential candidates: Mike Macdonald Harbaugh spoke of Macdonald, 34, as a future defensive coordinator when he served as a Ravens assistant from 2014 to 2020.