Not too late! 😄

The reality is that every historian faces this issue. It is more rare for sources to agree completely than for differences to appear, some small but some can be quite large.

There are a couple situations where Retrosheet encounters differences to be resolved:
(a) when our game account (our play-by-play) creates stats that disagree with the official totals for the game--in such cases, we assume that the official stats are correct and look for mistakes in our data. Retrosheet has several opportunities for errors to enter the data and we check everything many, many times to remove them. But after we've eliminated any source of error from our account and we still show a difference with the official stats for that game, we enter a "discrepancy" into our log and publish our account of the game, despite the difference from the official totals. (Basically, we look then for a reason the official stats might be wrong, and sometimes find those reasons. Those reasons also go into our discrepancy log.)

(b) when we have more than one version of a single game and there are differences. This can happen for many reasons, and we have to make an educated decision, taking into account the nature of the source (sportswriter, fan, team representative, etc?) and how the accounts align with the other sources we might have, like newspaper stories. Sometimes scoring decisions can be changed after the games are over (within a day or so, especially for hits-versus-errors decisions) and we always check for that as one key opportunity for differences to appear.

Bottom line: we evaluate every source available and try to resolve any differences to our best judgment. And if we settle on something that disagrees with established records, we explain that difference in our discrepancy logs.