You may be right about the reason, I don't know. But the pen needs to figure it out. Over the last month, a period in which the Tigers were 4 games under .500, the starting pitching was the best in MLB by xFIP. It was 10th in ERA. The Tigers offense was 14th in wRC+ and 10th in runs scored per game. The bullpen during this time had an ERA of 5.16, good for 28th in MLB. It's xFIP was better, at 14th. So they are probably a little unlucky, but that is what happens to bullpens that don't have high K rates. Royals pen has the same problem. That will catch up to them. So will the fact that they are currently second in MLB in hitting with RISP. Considering they are 19th in MLB in wRC+ I suspect a serious run scoring regression is on the horizon for them.