Holy shit. Look at page 6. The line "No one can experience the same time as others." takes on a double-meaning given this twist:
Meaning #1: No one lives completely the same life as someone else.
(Foreshadowing) Meaning #2: No one experiences the passing of time the same as another. Usogui clearly manipulated leader's perception of time to be different from his own.
Brilliant.
Also ... the Kariume came out.
EDIT: Something really cool about the artwork: the last page of Ch 523 has Usogui holding the handkerchief. If you look at the last page of Ch 521, Hal is holding it looking the opposite direction. If you put the two images next to each other, it looks really cool.