This is a very difficult topic (at least for me).
For example, If you know the swedish band Roxette, one of their singers, Marie Fredriksson passed cause of cáncer.
When they play "It must have been love" new singer Lena (and of course all the bandmates) dedicates this song to Marie on every show.
(And I mention this because is one of my favorites bands).
Maybe LP could dedicate at least one song or dedicate a few words?
Yes.
But at the same time, if they feel that it's not necessary, it's ok.
Maybe they pay respect every day on private. We don't really know how they feel or what they think (Phoenix, Joe and Mike).