I've been lurking and really enjoying the series as well as the theories! Thought maybe I'd chuck my twopenneth in...
I think the big bad crime bosses are the same across all 4 series. In the past, Nick Huntley has done some dodgy legal work for them via Jimmy lakewell (think he might have been a bit of a rubbish lawyer and needed cash to fund fancy lifestyle). He's got in too deep and/ or Roz has found out and got sucked in trying to keep it hidden (hence "everything I've done is for the family" ie keep Nick earning, alive and out of jail and possibly crime bosses influenced the career break). In the separation to keep Nick safe she's been getting more and more compromised and ended up framing farmer. But is also looking for a way of the big baddies getting caught without implicating her. Maybe she thinks Hastings is involved so thinks that by taking him out of the equation she'll get some breathing space?
I think the whole thing with Hanna was staged and ifield realised there was something dodgy going on and wanted to question hanna. I cannot believe he thought roz was dead and wonder if he was actually trying to demonstrate what the girls' murderer had done and how this would be picked up by forensics rather than actually hurt or kill roz. However someone (Nick? Hanna?) Called for back up and the heavies/ clean up team got called in.
Roz hurt her arm in the scuffle, didn't get treatment and arm went rotten. Although mrsa isn't really the right bug for the way the wound behaved and smellt! Although the hospital would have wanted to keep her in longer, some antibiotics work as well orally as by iv and the main source of bugs has been removed so she should be feeling relatively better. But nowhere near as well as she is!!!
So basically it's as clear as mud! I do think Hilton is dodgy but maybe not involved with the big organised crime baddies. I can't work out why maneet is feeding him information unless she also thinks Hastings is dodgy. I'm so not sure about jamie. He's clearly been planted for a reason but he didn't put up much of a fight to stay. Hmmmmm. Jimmy is definitely a baddy but I don't think he gets his hands dirty, the balaclava man/ men will be much further down the pecking order of the organised crime thing.
I don't think Hastings is a baddie but was trying to hold onto dots declaration until there was enough evidence to get the biggest baddies sent down. Now he looks dosgy for bot sharing it and the big baddies will live to fight another series.
I've probably missed load out and have forgotten most of the early series but am obviously a bit overinvested! We're away this weekend so will have to wait until we get back to watch the finale 