WMG
Blue Kirby stole the heart of Blindeye's girlfriend.
Blindeye Samurai's wiki page states that his girlfriend was killed when a thief stole her heart. Sure, it was probably some random thief, but what if it's Blue Kirby? He is a thief after all. The Kirboys team idea has been written out of the series.
On the ARA characters page on This Very Wiki, it seems like Kidsy 128 has removed all information about the kirboys, including their folder. This is a possible hint that the kirboys note are being removed from the series.- Jossed, they were mentioned in the UFO story.
