Dubon is making the postseason roster because of his defensive versatility. Meyers has no business being on it. Hitting well in AAA doesn’t mean his second chance in the big leagues comes in the ALDS. If they really thought he was ready to return to the big league club, he would have needed to be up earlier this month to get at bats and his timing right. That hasn’t happened.
I also doubt the Astros have 14 position players on their postseason roster for the ALDS. I could see a 13/13 split if they want Lee on it so they have flexibility in how they use Vazquez.