He changed his theory because he found an individual who is from on/near property who lives in Queens. A good sleuth adapts with the evidence and looks into all possibilities rather than sticking their foot in the mud. Is profiling even that useful?
Profiling is a lot more useful than waiting for information to come out and changing your opinion. If that's the case, then I'm absolutely brilliant, I know who killed Joni Lenz, it was Ted Bundy!