I must hypothesize again that there is a talent issue here, specifically Avila players vs Harris players, vs it being a coaching issue.
You may remember this post of mine:
I which I showed that when it came to controlling the zone this season, the Harris players in aggregate were among the best in baseball, and the Avila players were among the worst.
But you may be surprised to learn that the end-of-season collapse was not the same for each group, and if we isolate September, we see there was almost no change at all for the Harris players, while it was the Avila players that ended up tripping all over themselves:
Full Season
Team
Avila
Harris
PAs
6093
3997
2096
BB% rate
8.4%
7.4%
10.3%
K% rate
23.9%
25.5%
20.8%
wOBA
.317
.318
.315
wRC+
103
103
101
Sept Only
Team
Avila
Harris
PAs
911
632
279
BB% rate
9.0%
7.8%
11.8%
K% rate
26.2%
28.0%
22.2%
wOBA
.294
.286
.313
wRC+
87
82
100
So I gotta continue to believe that the hitting coaching is not the issue, and that the more Harris turns over the roster to be more players he acquires, the better overall results at the plate we will see.