If Bill Belichick seemed terse even for him at the recent owner’s meetings, it might be because he knew that his offense was losing its most unique and irreplaceable player in Rob Gronkowski, who announced his retirement this week. Finding a solution for Gronk’s absence will be tough—he was the best combination of receiving and blocking at his position in NFL history—but if anyone can pull it off, we know it’s Belichick, even if it makes him grumpy in the short term.