The compare function is the single best way to compare two images to decide if it is a keeper or not, this should be included in the Cull Mode, without it, I do my culling outside of Cull Mode! That way, I can cull the blinkers and decide on my money shot at the same time.
Current workaround
I just do my culling in the main catalog, and compare the shots one by one using the Compare function, how can I decide what is a keeper if I can't compare them? This way, I can cull the trash and decide on my money shot at the same time.