The point with the drones and spirits was assuming someone actually has a reason to be mad at your PC's. Drones are going to ignore pretty much every power you mentioned except Psychokinesis and Weather Control. Illusions just don't work on them (except physical ones) and neither do magical mind control powers.
OK, normally I'd say "someone standing still" is a good defense. Here, though, you're talking about someone on a rooftop. Someone eight feet tall with four arms, his buddy the ghoul and a Pixie. I ignore the Social Adept because he could conceivably blend in on the street. The other three are distinctive in a Distinctive Style kind of way. Trying to do legwork on any one of them is at +3. With a group this obvious I'd say its totally reasonable to look for them as a group at +9. Also keep in mind that "just standing still" is a crime when you're doing it near Knight and have no civil rights. The pixie and the nosferatu aren't even people by Seattle law, the other two may or may not be depending on how good their fake SIN is. In Bellvue, though, they're guilty of DWT (Driving While Troll). Anywhere nicer than the Barrens, they're going to be facing prejudice and everyone will remember them. The future ain't a happy place if you're not rich and human.
Having said that, let's take the other side instead, Damien Knight. Knight is powerful, blindingly rich, has thousands of employees and is not stupid. If your team, which really stands out, is watching him through binoculars, there's a Yakuza sniper on another building doing the same thing, and a Lone Star sniper and a Mafia recon drone. Think of it this way, Knight is the brain of a Great Dragon scale character knows as Knight Errant. The chief of police for KE Seattle is one of the hands. The head of Seattle special operations is another. The body is the collective of all the facilities, resources and so forth in Seattle. The head is a vulnerable target that's easy to hit. The hands will use the resources that they have access to in order to protect the head.
On a daily basis, Knight has to deal with organized crime figures, rival corps, angry politicians, rivals from below in KE, people above him in Ares who are afraid he's gunning for their spot and the Shadowrunners that all of the above hire to make his life a living hell. He's still alive. That should tell you something. He also runs a company whose specialty is providing contract coirporate security. OK, sure, that means they're the same guys you face on an average Run but they don't all come from the Imperial Stormtrooper Academy. That Tower recon setup, he probably already has one of those. Undercover KE security? Check. Someome to run image recognition and see if a particular individual passes him on the street to often? Check. Anyone suspicious within a block of him is being watched by someone. Crack hacker research team to look into potential threats? Check. Are your PC's conspicuous? Check.