It's hard to say whether the shoulder was a long term concern for Daulton. I do recall it was mentioned he initially hurt it diving for a ball in the field, and it was further aggravated when he collided with Pete Alonso when on the basepath. I suspect the increased swing speeds could be a case of Daulton strengthening his overall shoulder and supporting muscles as part of the post surgery rehabilitation, and retraining his swing afterwards may have unlocked a bit of new athleticism as well. Hopefully he maintains the swing speed gains moving forward.