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Couldn't a criminal leave enough info to point to someone else? Then Krebs exposes a mark.

That’s what the CIA does. See shadow brokers and the toolkit used to “change” attribution.

Yep this is what happens most of the time.

Is there evidence to support that "most of the time" he unmasks marks instead of the real actors?

... No

You tried to gather evidence and were unsuccessful or you are guessing none exist?

I assumed as much.