At his end of March press conference, Vikings head coach Mike Zimmer said he will be making some changes to his defensive scheme - big and small - in order to change and adapt to the changes offenses have been making over the past four or five years, and also so they won’t have to install as many adjustments each week during the season in their game planning.
Of course he didn’t spell out what all the changes will be, for every opponent to know and plan for, but we can look for clues, based on what he did say, along with recent roster moves, as to what changes he may be planning to implement.