This is fascinating. Plus, they should be able to do DNA on all these samples and if they are "connected" and belong to the same person, they should match. I don't think there is a "time limit" on DNA.
Someone here will correct me (I'm sure) If I'm wrong. :o)
While some scientists have detected blood fractions and determined them to be of the AB type, others have not. In fact some claim that while it is blood, typing blood that is so old is not too useful. Others claim that ALL blood that is this old will type to AB.
As to the DNA. Not a chance. The DNA is far too degraded and contaminated (with other DNA from everyone who has been in the Shroud's presence throughout history) for anyone to be able to sequence or do a comparison with other degraded and contaminated blood from the Sudarion.