I always liked adding young late in season or even season in general. Yesavage last year be an example.
They bring enthusiasm to a long season. Scouting reports are less on them helps also.
Not for what we gave up. The 11 WAR must mostly be his glove. Because his OPS is around .700. Pillar's WAR here was 2.0. No big difference
Average centerfield WAR is 2.5.