Specifically on Chapman, his pull rate on flyballs was WAY down in 2023. Just check out these numbers: https://imgur.com/a/RYlcSaH
https://www.fangraphs.com/players/matt-chapman/16505/splits?season=0&position=3B&split=3.2
Pull rate is abysmal, and the Centre rate of 45% easily explains why he missed out on a s*** ton of homers.
If we continue to look at flyball rates, Springer's page is similar... though his is weird in that he seemed to go oppo more in his younger years, then when he came to the Jays he had a very high pull rate between 2021-2022 before going back to his early career splits.
Vlad is a hard one to figure out, but his centre% was closer to the 40% he was sporting in 2019-2020 vs his good years in 2021-2022.
Anyways you could do a full analysis and dive much deeper into this, I just find it extremely difficult to pass off as a coincidence that most of our guys started pulling the ball less all at the same time.