The key in the whole detective issue is that the detective is not reliable. The detective has the potential to find key information but can also miss it. For example, Battler. Battler did zip as detective though he was claimed to be detective for the first 3 episodes.
I think detective in this story is more like a super power, Spider-Man isn't constantly shooting webs but he can choose to do so. I am not exactly sure what Oliver is trying to say but this would be my opinion on detectives in Umineko.
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