How could they schedule it for yesterday? They never ask a player to play doubles before their singles, and Kim had her singles match at night.
The night before, Ai finished her very tough singles match very late. To allow her to get the usual rest period before her doubles would have run the doubles match way too late into the night. So my guess is that the 4 players themselves opted against that.
So it's not like someone is up there trying to make things hard for Kim and Ai; it just worked out this way because they are both still alive in the singles.