And my point is that there are no distinctive markers that say this blood is "Jewish" from any other semitic blood in the middle east. There are no specific DNA markers that will state categorically that this person is Jewish. We can state that the blood genotype is AB negative which is a good indicator as it is much more likely to be found in that region and among those people of Middle Easter descent than anywhere else in the world. But the DNA is now too degraded to do much more after 2000 years or so.
Somewhere on the Shroud there may be some that is not, but we do not have full access to the Shroud to find it.
Yes. I understand the point you made. I have the memory of seeing evidence that there are specific genetic markers.