Let’s make some assumptions about the postseason roster.
Assumption 1 - the team will carry 13 relievers.
In the age of the universal designated hitter, there is no real reason to have a bench of more than four players if the maximum number of pitchers allowed is still thirteen. All managers will do this henceforth, so we know what Rob Thomson is going to do. There is no need to concern ourselves with who those thirteen are right now since for this purpose, it really doesn’t matter.
Assumption 2 - we know who the starting nine will be in some form.