I don't understand these kind of criticisms such as "this arc is boring" or "why wont this manga end already"
Because if it were to end last year, there would be plotholes appearing. Plotholes such as: What did the knockers do over the time to counter Fushi?
We already know that the knockers have intelligence (changing targets from Fushi to mortals, Hayase's knocker learning human language, and making decisions of themselves)
So im literally sure that some Knockers has taken the same path that Hayase's knocker took: Hiding inside a human body like a parasite for hundreds of years until to the point that it's very faint for the hooded man to sense it.
And im sure that the boy is also has a knocker parasite in him. Or possibly the knocker controlling the boy since birth since he's acting strange.