Darkest Before Duskmon

Summary
After defeating Arbormon, Duskmon begins to fight all the Legendary Warriors. Their attacks do little to hurt him until BurningGreymon gets angry and engulfs him in fire. Lobomon is skeptical of victory and tells everyone to run away, much to Takuya's chagrin. As they're setting up camp, Takuya and Tommy come up with a plan to defeat Duskmon, but Koji gets angry and takes Takuya aside to talk. Koji insists that Duskmon is too powerful, and the two fight. Koji asks Takuya if he knows why he's here. Suddenly, Duskmon attacks and the Digidestined put their plan into motion. It fails when Duskmon absorbs all the attacks. He turns to attack Agunimon, but KendoGarurumon jumps in the way and reverts back to Koji. Upon hearing Koji's name, Duskmon begins to act as if he's in pain and engulfs the area in darkness. When the darkness clears, Takuya finds himself alone and at the Dark Terminal. DarkTrailmon offers him a ride home and he accepts.

Continuity

 * Duskmon's reaction to injuring Koji foreshadows his identity as Kouichi.
 * In episode 32, Koji says he has always known Duskmon was his brother. This may have been hinted at by Koji's reluctance to fight.