Disclaimer - I am not into all the modes of this game - I'm just a simple "fire up the game and play some exhibition games" type of player. I don't really get into Franchise Mode as I'm 47 and don't have a lot of extra time.
I love playing with the many historical rosters, and those mostly occupy my playing time.
What I am providing - provided that my schedule allows me - is something I did for MLB 2K games: an updated "Living Roster" that is based upon RosterResource.com with updated transactions.
Using this site:
https://www.baseballpress.com/lineups?q=%2Flineups - I just put in the daily matchups and lineups and play for fun, seeing how close my results might come to the actual games.
My PSN is mkharsh33 - and I've uploaded 4 different roster sets to this point. I do basic updates on things I see regarding attributes, but not much. Missing CAPs are added. The minor leaguers are really irrelevant as this is for 25 MAN MLB ROSTERS. This is not meant for any other mode except Play Now / Exhibition. Enjoy!