Just thought it would be worth noting why Rob Ford won't come clean and why Doug won't let him. I don't believe it has anything to do with manipulation and everything to do with covering both their asses.
An admission the video exists now also links Ford in the illegal efforts to retrieve the video, which is far more serious for him legally. So no way is he going to admit he is in it or it exists. It also puts him in the company of people he could be connected to as part of a wider murder case.
Second, he's not going to resign because he knows being mayor is the safest place for him to be. He's not a private citizen and therefore makes it difficult for the Crown to proceed with difficult charges against him unless they are absolutely foolproof.
Finally, any admission of guilt even in this case leaves him open to charges along the lines of what the TPS is likely after. Extortion. Murder. Influence peddling. Ford cannot blink or else he and many others could be potentially screwed.
This isn't about psychology or stubbornness. This is about crime. Plain and simple.