In the Devers case, the SSS are not "the only ones we have.
With Casas, his history is riddled with sporadic playing time, surrounding periods of being on the IL, but overall, he's done pretty well, when he plays, until this April. He's had other bad streaks, and the Dalbec worries have some merit. Dalbec had about an .800 OPS after his first 550 PAs, while casas does after 950. Both are kind of small sample sizes. Casas has about 50 points on Dalbec with OBP, but Dalbec was about 50 higher on SLG. Casas has 250 Ks in 950, while Dalbec had about 200 in 550.
The recency factor of a players last 40, 60 or the almighty 80 does matter, but when you see that Devers was on pace for his career best OPS in 2024 as late as September 1st, 2025, I think the "80 game" sample size has to be taken with a grain of salt.
He has a .689 OPS since 9/1/25 in 51 games (225 PAs) He hit .709 in August in 24 games and 110 PAs. He was at .791 from 8/1/25 to 8/25. I just can't believe this two sample sizes, combined is what should be the most important numbers. If you want to get technical, Devers' poor sample size is just 54 games long: 8/26 to today at .657. (Not really the full 80.)
Casas is a whole other story.