At the start of free agency, there isn't much to complain about how the Patriots have gone about business, as they have signed some stellar talent at needy positions and haven't lost too many players that will dramatically impact the team. The only exception would be defensive tackle Khyiris Tonga, who became a productive contributor on both defense and offense when needed.
Now that he's going to continue his career with the Chiefs, the Patriots need to find his replacement on the defensive line. There are plenty of free agent options available to consider, or they could look to the draft and use an early pick on a star player.