User blog comment:ChiisaiAoi/Kapitel 97 - Verloren's Execution?/@comment-218.186.15.10-20130701100203

But in the chapter where the Ghosts are confronting Verloren, you can see that Verloren is exactly the same size as each Ghost. Maybe he appears so large now because he hasn't been completely revived.

About the gender-size relation theory you suggested: In the anime episode where the Chief first appears, he's shown to be much larger than the human soul kneeling before him. So there might be something to your theory after all.