I wouldn't be using silicon on the cam cradle personally. I know it seems a p1ss take but anaerobic flange sealants aren't cheap anyway, it's not just VW bum raping us for the sheer hell of it.
As I said, the Wurth stuff is good, and Permatex do good Anaerobic flange sealants too, if you can find any in this silly little backwater country.
The engine won't suddenly go into meltdown from using the wrong stuff, but like reusing stretch bolts and turning the boost up.......you've pulled the pin from a grenade. Who knows when it'll let go, but it will.