Sooo, which one is your current #1 of 2021 so far? Sounds like it's the Elijah Craig 18-Year or JTS Brown.
I talked about this with a fellow regular customer at my favorite shop yesterday, and he pointed out that even if Sazerac actually keeps the original mashbill after the old stock they bought runs out, it will most likely be with their own yeast strain and not with Brown-Forman's, as that is specific to each distillery. Having had Old Forester's Signature 100 and Woodford Reserve distiller's select, I kinda get the resemblance.