Excuse me but both your statements are wrong, counter to the research and peer reviewed papers.
Blood of Type AB has been identified on both the Shroud (in every location where you see blood that has been tested has tested positive.) The report of the image NOT being under the blood is much more than "an off hand remark" about a "casual observation of a single fibril." It was a specific object of investigation and was completely proven.
I'd be interested in seeing the report.