Probably unintentionally but after Takeru defeated Juzo once and for all, he nearly fell into Gedou until his team members snapped him out of it. Here, no thanks to Bladerun of the Chimatsuri, Takeru became Gedou until Alata snapped him out of it by force who then also snapped Gosei Knight out of his own brainwashed state some time later.
Whenever a Gedoushu is slain, their second life grants them a much larger and more powerful form. So why does Shitari just flat-out die when the Gokaiger slay him? Because he gave up his second life back in Act 46 in order to give Oborojime a third life with which to defeat the Shinkengers.
Early Installment Weirdness: When the Gokaigers present the Ranger Keys of the five Red Rangers, they actually call out "Ranger Key!" just as Sentai teams normally call the names of their weapons when they bring them out. They never do this in the series and this is edited out when the battle is shown again in episode 40.
Evil Costume Switch: Gedō ShinkenRed has a black vest that looks like the one he wears as a Super Shinkenger.
Psychotic Smirk: Takeru sports a very unsettling one just before he transforms into Gedō ShinkenRed.