First, I will say I am not saying defense is even close to the value of batting or pitching, and I'm not sure who you are talking about . To say we "MAY HAVE" lost 15 games "IN PART" to poor defense is an accurate statement. It might be more like 25, if you count no error runs allowed. Yes, we have won some games due to good defense or poor D by the opps, too. (I thought that was a given and did not need to be stated.)
Now, although ERA measures "earned runs," I ask how many earned runs were preventable? Every team sees some runs score on plays not called an error, but clearly a makeable play not made leads to many runs scored over a season for all teams- some way more than others.
It's unclear how many of these runs have scored, but am 100% certain we allowed more than the norm, and likely bottom 3-5 in MLB, despite the plus OF defense. Our ERA is ranked 21st, but where would it be ranked with a plus D?
Here's a glimpse at whatour ERA might have been with good D:
9th SIERA (3.93) a measure based on taking out the defensive aspect of pitching outcomes.
10th in xFIP (4.03)
14th in ERA- (97, which is 3% better than the norm) which factors in defense, park and I think strength of opponents.
Go ahead and tell me all three of these stats that show defense matters with pitching results are wrong or overblown. Maybe they are overblown, but defense makes a big difference. NOT AS MUCH as pitching or batting, but it matters, a lot. Not freakishly a lot, but a lot.
You ask a staff ranked between 10th and 15th to get 120 more outs, maybe 20-30 more than the norm or 50-60 more than the best defensive team in MLB, and watch the staff struggle. Watch the added pitch counts and IP take it's toll on starters and relievers. Watch the Sox staff implode right before your eyes.
No way is defense solely responsible for the team's implosion or the pitching staff's woes. Of course, it does not. It's not the D watching Crawford head towards 30 HRs allowed, but the defense matters, and it matters a lot.
IMO, a bad play in a key situation has a tremendous negative effect on a team's psyche and morale. Yes, so does a home run or a HR allowed. So does a great defensive play on the flip side. I get that.
Outs Above Average:
-20 BOS
+33 KCR
You don't think 53 less outs made by our D over KC's might mean we have a better record than KCR?