Exactly. The Hawks are not a team that has ever blown a lot of people out. Even though I bet their point differential in the league the last 5 years is one of the top 6 or 7, that's b/c of their win-loss record (which is #1 in the NFC, #4 overall I believe). But they win a lot of games by 10-13 points, just not many by more than that.
All coaches will do that to some degree, but Holmgren more so.