"The one thing that's absolutely clear is that Karl was not the source for the leak and there's no basis for any additional speculation"

This quote by Robert Luskin is a clear declaration that Karl was not the source of the leak. It is a definitive statement that there is no evidence to recommend that Karl was the source of the leakage. Luskin is trying to put an end to any further speculation about Karl's participation in the leak. He is highlighting that there is no basis for any additional speculation and that Karl must not be delegated the leak. This quote is a strong statement that Karl is not the source of the leakage and that any further speculation is unfounded. It is a clear message that Karl ought to not be held accountable for the leakage which any further speculation is unnecessary.