Jesus-motherfucking-Christ! Oh!Great finally, or it seemed, that he went back and hinted possible progress in one of AG's biggest mysteries: that Uncle Minami character.
that guy making and sending all those paper airplanes flying had letters inked on his fingernails and I daresay that its no coincidence. though the letters that we've seen when Uncle Minami made one of his few appearances were different (the letters on his fingernails were D-D-E-V-L), the guy on the train particularly addressing Ikki I believe will shed some light on the remaining questions of the Gravity Children Project.
oh, and the rest of the chapter was boring shit that just delays the advancement of the GST even more.