It is better to ask Rav Brog what he meant. I am sure he will have a great answer for you.
I have heard many of his shiurim. Always filled with Taam Vdaas.
There is a famous story of the Brisker Rav’s minyan, when he lived in Jerusalem, waiting during Chazaras Hashatz for a Kohen to come and bentch Birkas Kohanim . Asked why he is makpid and will wait so long until they find a Kohen ,he said that people wait on line a long time for brachos from Tzadikkim, so Kal V’chomer for a Birkas Kohanim.