Ihave no idea where you get your info from, Oscar, but the police have been keeping up a presence and search-parties all over Tameside, esp. Droylesden, and a bit of Beswick. I see them massing sometimes first thing in the morning at Mottram round-a-bout.
You will know how big Hattersley estate is, and the fact Creggan could be 'on the estate' means probably thousands of acres and tens of thousands of homes. I also have no idea why you are implying that GMP are being dishonest.
The back story briefly is that for about 10 years there has been a family/gang feud bewteen the Shorts and another family 'supported' by Creggan and others. Organised crime is the root of the dispute and why it suddenly flared up with multiple tragic consequences.