Why does the version of the comic posted by Collector have so many blackened balloons? I have the Italian .pdf version on my budget CD copy of GK3 and I remember they were all filled. I guess there should be better copies somewhere on the internet or in someone's CD GK3.
Anyway, it really should be included as it gave hints (I won't say more) to gain some points in the game that otherwise would be missed, so it is somewhat part of the game itself.
EDIT: With a little research, here are the graphic novels for both GK1 and GK3, apparently complete and in a good format:
http://gkart.ucoz.com/load/5 I still hope to see these .pdf among the games' goodies.