A 'plot hole' in Exceedraft E13: Fujio takes Ken to the ring for illegal deathmatches at 7 a.m. where Ken has just one fight against Kogure. Shortly after, Ken and Fujio have their final showdown at sunset.
Ken's fight against Kogure could not have lasted for almost an entire day without any breaks. Yet it's treated as the main event for their audience who settle in with their wine and piles of cash for betting on the winner.
My theory is that initially, the episode is supposed to feature an actual tournament like in the movie Bloodsport (1988), which has possibly influenced the episode's premise. The time lapse between Ken getting caught in the villain's trap and the case's resolution would be more realistic if Ken has to first defeat multiple opponents before facing off with Kogure and rescuing his friend.
Shots from E13 only included in its preview shown after the outro of E12, like Ken removing his gloves and throwing them aside, suggests the possibility of other omissions and discarded ideas. One of them could have been Fujio hosting an illegal tournament, that'd heighten his profits from greater betting and entertainment, rather than just one fight.
In the finalised version of E13 itself, Exceedraft begins taking on the case of missing martial arts fighters before Ken learns that Kogure is one of them. The episode could have circled back around to resolving the missing person reports that started the case, but it didn't and solely focused on Ken’s personal stake in his fights with his friend as a victim.
Way earlier in the Showa era, another Toei tokusatsu Denshi Sentai Denjiman (1980) has an episode with the villains coercing the hero to participate in a dangerous boxing tournament. The premise of Denjiman E40 is similar to the story in Exceedraft E13, yet there are vastly more characters involved in the Denjiman episode. While keeping its focus on the fights of the hero and the victim, Denjiman's hero is shown encountering other fighters captured and caged by the villains.
Lowering the overall headcount in Exceedraft E13's case creates an inconsistency, in other words a 'plot hole', in the villain's scheme. As far as television tokusatsu goes, it's not a particularly bad or noticeable one for a viewer swept along by the episode's chain of events.
Also, the lowered headcount creates more room for exploring the mental and physical fight between Ken and Fujio, and Ken's rescue of Kogure. It brings the most important characters into closer proximity to one another for intense 1-to-1 clashes and drawing parallels and contrasts for illuminating the hero's psychology.