Read much? He states the closest case law He could find are mostly roadblocks. You stated that there was case law stating what you claim. Can you please provide? Thanks.
I’ve read sufficiently to know that roadblocks (e.g. near a bank robbery) are allowed. The equivalent here would be a roadblock around the neighborhood. There is case law where evidence was allowed solely because a cop had a hunch about about a house. But that is as far as it goes. Random searches are illegal. Exigent circumstances means there must be specific reason to conduct a search at a specific house. You can read tons about it and you will not find a single case where they were not arguing about the specific reason and whether that reason was valid. In no case was “perp in somewhere in neighborhood” given as a reason or anything close. That would be laughed out of court.