Q. If someone who does not regularly attend this minyan, shows up and claims that he has yohrtzheit, should he be given priority to daven for the amud, or do the avelim who constantly daven there take precedence?
A. Horav Shlomo miller’s Shlit’a opinion is that the Avelim who constantly daven there preempt the yohrzait, and they will daven for the amud.
However, if the yohrzait attends even only once a week, but does so regularly, he may gain priority over the other avelim.
Rabbi A. Bartfeld as revised by Horav Shlomo Miller Shlit’a