I am not sold on EDC as GM. I don't think he's bad, but the vast majority of those seasons were with Newsome as GM. I think the value that Newsome got out of the draft was absolutely insane, and I don't think EDC is on the same level.
I have no idea how to divy up the credit, but I do think that it's a fallacy to consider all the drafts through 2018 as 100% Ozzie and the drafts from 2019 onward as 100% DeCosta. DeCosta was heavily involved in everything but especially the draft before taking over as GM. Ozzie remains involved since stepping down.
I think it's definitely a demarcation like that over time will be more meaningful, but I don't think it's reasonable to look at it as two completely separate management teams where the successes and failures of one are completely independent of the successes and failures of the other.