What do you think?
The blood is a bad place to start if you want to try to pass this shroud off as authentic.
If it is NOT blood, then the shroud is clearly a fake.
If it IS blood, as it has been claimed and typed (unconfirmed) as AB, then the shroud is also clearly a fake, since the blood type AB did not exist yet during Jesus' time, nor for many, many centuries afterward, and even today in the Middle East, AB blood types are the extreme minority.
However, it's an item in which a very large number of human beings have put their faith. That makes it *intensely* powerful. So it's probably something he has to tread carefully around.