As my previous experience has taught me, investigation results can be bullshit. I doubt Blade would make a bullshit cop like some other mods not to be named, he still could be a Don and immune to it. I'm more for your theory that Scobble is going to be immune to a night kill because it would mean Cyber is innocent by proxy and mafia can't be targeted by each other.

This theory doesn't in any way make Scrobble innocent.