I have heard in the name of Rav Yisroel Salanter that there is an inyan to poskin like a given posek on their Yahrtzeit, even if we would not poskin like them the rest of the year.
Two questions: 1) Where is this recorded? 2) Do we have any record of it being used in a psak? For example, if someone would want to do some sort of elective surgery that is subject to a machlokes achronim, they could be suggested to schedule it for the yahrtzeit of the Acharon that matirs it.
Note: I understand that even those who hold during Sefiras HaOmer you say "LaOmer" will still refer to the 33rd day as "Lag BaOmer" in respect of the Rema who held you say "BaOmer", and whos yahrtzeit falls on the 33rd day (in our fixed calendar). However, I believe that when actually counting the Omer that night those who say "LaOmer" do not switch to "BaOmer".