It's like a terrible fanfic gone horrible right.
I liked Soul eater initially because I found the premises of the universe to be quite appealing, but the highly disjointed story severely lowered teh overall quality of the manga. Chapter 73 made me stop caring about any of that and laugh myself silly. Traveling through Eibon's book seems to be an excuse to explore every fanfic scenario and absurd situation possible.
I'll leave you with a few scenes to ponder. (oh yeah, they've swapped genders btw...)