Here's what Law said about Cowser before the season:
Cowser reached the majors last year but continued to struggle with the same issues he had in Triple A in 2022: He doesn’t hit lefties, and he doesn’t hit non-fastballs, or at least doesn’t do either of these things well enough to project as an everyday player. He’s a 55 defender in a corner with a 70 arm, and he can handle center on a short-term basis, so there are plenty of ways for him to generate value — and maybe get more reps in the majors to work on either of those two deficiencies. I think he’s a good fourth outfielder right now, with some small chance to become more because he can defend, can whack a fastball, and does make pretty hard contact.
FTR, Cowser had a .769 OPS v lefties last year in AAA, which was a vast improvement from his initial struggles in '21 and '22 vs lefties.
He's going to develop into an everyday player. (Law's take will age poorly).
Edit - I say that cuz he's hitting to all fields with power. He'll continue his development vs lefties.