I think you would be giving the Court too much credit for putting that much thought into their decision. And I think even more important we know how good the FBI is at "cyber" that there would be no issues in attribution of traffic to an IP address. So this is really blanket permission for the FBI or any .gov to hack anything internet attached.
Oh, I don't think it's too much credit to consider the court thinking about those things. They might do it by analogy and get it all dreadfully wrong, but they often get down to the nitty gritty implementation details.