Chiyuv Precedence for Davening
Question
As far as I know a person who is in his shloishim after the loss of a parent even if the shloishim was cut back because of a Yom Tov that occured within the 30 days he is still a chiyuv as far as Davening as a Ba"al Tefillah is concerned. What happens if another person in the minyan has Yahrzeit for a parent, who takes precedence and should be Ba"al Tefillah?