Good visual.

According to the article from HomeTheatherHIFI, the LFE is not always entire channel. Since the entire channel for each speaker is set to small and summed with the LFE, the crossover for the mains is also applied to the LFE.

So, in 1 and 4, the LFE is only 60 down. This is what confuses me so much.

Also, and you probably know this, but crossovers are not a step at 60, 80, or 100, but a gradual slope. You probably just showed it as a slope for ease of use.