Situation: The other team stated they will only have 4 players tonight so we will need to decide on the double post or makeup match. Then their 5th player showed up later, do they get to play now?

No, since the other team confirmed with you they will be shorthanded you have the choice to double post, do a makeup or play that 5th player. Similar to changing a roster after scheduled league starts teams post according to information they have.

Rule: Bylaws page 1 under "Purpose" (unwritten rule, highlighting bylaw that covers unwritten rules): https://apa-by-laws.s3.amazonaws.com/prod/921_bylaws_2023.pdf 

This section also covers:

• How many times you can double post and when.
• What combination of players from your roster can play that night when double posting.
• Choosing a double post or makeup.
• Who chooses the player who double posts.
• What to do if both teams only have 4 players.

You can submit a "Rule of the Week" to the league office:

• Email to sandiego@apaleagues.com.
• Email Subject Line must read “SDAPA Rule of the Week”
• Clearly state the rule/situation and if you know where the answer is found please provide those details.