You're assuming that the mayor is the big fish. It's possible that the mayor ordered a hit from someone seriously connected. Or that he made phone calls with Lisi where he discussed other people's business. Or a number of things. Busting the mayor would send everyone deep underground. Maybe they have wires on a bunch of people we don't even know about. Right now it appears that only the Toronto Police are working this case, and that they don't have anything on Ford. For all we know the RCMP and OPP are involved, and they're using this whole fiasco to "heat the wires" basically putting pressure on the weakest link (Ford) hoping that it'll cause other people to talk or and make a mistake.
This has been my thinking of late. Why Doug always jumps in to defend him, why his family still refers to him as the diminutive "Robbie", etc. He is a weak link for the family, at the very least in their eyes.
<my wild imagination>
The following is all circumstantial (and I have my own doubts) of course, but the following made me wonder:
The sheer number of Italian names in all of this made me start to ponder mafia ties. Lisi, Basso, Belissimo and others.
Frankly, the clothes, gold necklace and (sometimes) bracelet that Doug wears outside of council makes him look like he walked right out of an episode of the Sopranos.
The mafia is still present in Chicago, home of Deco US.
Having knowledge of the printing industry it always seemed an odd place for a printing company to set up shop. Paper prices are far more competitive in areas like Pennsylvania, closer to the hardwood forests and paper mills of the US north east (and now imports from Quebec); precisely why "the Office" was set there.
My mind then began wondering if they do any serious amount of shipping between Deco US and Deco TO, and whether it's at least partly a front for smuggling drugs and guns cross border.
</wild imagination>
All conjecture aside, "outing" the video did seem to keep focus on Ford, rather than connections to Project Traveller. As to whether that's intentional or not, we'll find out eventually.