I bet even Fujimoto doesn't know what's going on.I have no idea what's going on, I'm just living from chapter to chapter.
It's implied by the Falling Devil that eating is not a requirement and just a mean the Death Devil decided to use as trigger to her ability. Effectively, she controls lives she took/ended, not necessarily the ones she ate. Meanwhile, Famine seems to "devour" life nearby to sustain herself, but the requirements were not explained nor implied yet.So by eating death can force the ones vored to obey her, somehow that power would be more fitting to famine instead, the same way famine's power seemingly would make more sense in death's plac