Great description of the Shane/Vic story JasonX, a couple things to add:
Obviously Shane is now in business for himself, as well as corrupting other cops. When Vic ran the Strike Team, it got dirty slowly, and he was very careful with rookies. Shane has none of the intelligence/restraint to operate as subtly as Vic in some ways did.
Shane absolutely hero-worshipped Vic, and this is his way of emulating what he thinks Vic is. Vic never gave him quite the respect Shane thinks he deserved, so he's pretty much being Uber-Vic. All of the crazy, none of the sense of responsibility or just plain sneakiness.