Zero Day's identity is obvious if you look at several oddities about the first mission...
There's almost nothing that you can hack into other than securty bypasses, with Sabine even mentioning they're practically ghosts. Of course, she'd make sure the mercenaries she hired were stripped of all electronics.
Bagley has multiple problems with disarming the bomb, including Zero Day piggybacking off his hack, which should be impossible. Unless Zero Day was in the same room as him. Sabine even mentions she's shutting off Bagley personally.
Sabine was clearly in the room when the mercenaries came in, but apparently escaped through a hidden passage, and looks none the worse for it. Of course, she would be unharmed, being Zero Day...
Why is seemingly everyone and their brother willing to turn against Albion? Well, the organization has suspended democratic processes and there haven't been any further terrorist attacks in a year. The Police State is everywhere and they haven't gained control over the press. As such, Albion has already worn down everyone's patience and is only getting worse. The only people thus unwilling to turn on them are those directly tied to the company or who have been wronged by DedSec.
Clan Kelley's power under the fascist regime of Albion seems like it shouldn't be possible but one of the themes of Watch_Dogs is the surveillance state (like fascism in real life) is that organized crime usually thrives under totalitarian regimes rather than the reverse. There's rare exceptions like Mussolini and the mafia but usually said regimes are grossly corrupt.
Why do most DedSec operatives use non-lethal weapons? Not only are handguns rare in the UK but there's a difference between recruiting people to do favors for La Résistance and getting them to kill for you.
Entering Aiden's mind in the DLC and the trips to get his stuff all represent his biggest regrets, including Lena's death. The birthday party represents how he hasn't been there for his family (made evident by Nicky's message) and the bloodstained house represents all the bodies he left behind in his career as the Fox.
How do people know DeadSec injured/wronged them even if it was remote hacking or indrectly done? They don't, Albion most likely just tells everyone their random ills were done by the group, and in these cases it's just logical enough to fit or simply distressing enough they want a name and it was given to them. Basically the propoganda machine lines up enough with reality they take the bait.
Also possible is that Albion will beat back the first waves of rioters (possibly thanks to the British army being ordered to assist them). But now there are hundreds, maybe thousands of martyrs to the people's cause. Even more people will join, and it'll go from street unrest to all out civil war, especially as members of the army side with their countrymen and (certain interpretations of) their oath to the crown, not parliament; as placards left by civilians near Buckingham Palace show, the people have become increasingly loyal to the monarchy, having looked to them for guidance during DedSec's absence, though documents in the area also imply that Albion may have engaged in regicide to further their iron-fisted rule of the country. Even if the people do come out on top, just how much faith in capitalism (kind of the point) or democracy (not so much) will the first world have afterwards?
Albion only arrested Thomas Rempart because he lied to them about his drones working without the BrocaBridge. That and possibly all of the mayhem that Jordi and Wrench caused that made them look bad. However, what is the likelihood that they might make a deal with them or just annex his company?
Jordi comments that he might actually be able to leverage that as an angle. Which means that Albion would only have grown stronger for our heroes' actions.
Just how long do they intend to hold Malik in those facilities? Forever?
I presumed that, once they'd milked him of any useful intel, DedSec would arrange a dead drop similar to what Emma Child did to the kidnapped operative, probably coordinating with Kaitlin Lau to ensure Malik's arrested.
Zero Day's true identity of Sabine, means that DedSec really WAS responsible for the London bombings.
To an extent, the rest of the old DedSec London was oblivious to Sabine's plans and were stabbed in the back by her, and the new team were oblivious to her true motives, she did not act in DedSec's name and once they knew what she was up to they turned on her. Furthermore the planning and actual placing of the bombs was done by Albion and Clan Kelly at Sabine's instruction.
In Skye Larsen's basement, there are four people cryogenically frozen, presumably victims of Project Daybreak. Presumably, they're Sinead, the two A.I.s you decommission on Nowt's missions and either Bagley or Skye, right? ...except Bagley is later shown in a nursing home, and Skye is cryogenically frozen under Broca Tech headquarters. This leaves one Daybreak victim unaccounted for, meaning that there's at least one neural-mapped A.I. still active, and potentially more if she stuck more victims than just Bagley in nursing homes.
Actually it's revealed that the titular A.I. from the Guardian Protocol DLC is one of Skye's A.I. if you play it after the 404 plotline, so that resolves that one, the possibility of others though...
