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Kaigaku is inexperienced as a demon. As a swordsman he was for longer in the business than Zenitsu and there is no telling exactly how much stronger or faster he would have become with one year more time like Yushiro postulated. Zenitsu is definitely above Kaigaku and Tengen in a healthy state is also above Gyutaro. The exact degree of superiority itself is more vague than the superiority itself, so Zenitsu definitely being around Gyutaro's level while not implausible isn't something we can know for sure. The same is the case for a healthy Tengen being automatically fodder for anyone to whom Gyutaro is fodder. Tengen and Gyutaro not being impressive compared to some of the stronger Upper Moons is kinda expected with some of the power gaps and the Demon Slayer Marks involved.The issue is that they don't significantly surpass kaigaku. It's even stated that kaigaku could've killed zenitsu immediately if not for his inexperience. So if kaigaku is weaker than gyutaro then zenitsu is around gyutaro's level.
It just doesn't really make sense and the scaling that makes tge most sense also makes tengen and gyutaro fodder which is strange.