I am just saying that these scientists are trying to change the rules of proof in a way that has little interest to the church. Surely, you realize that there is no way that carbon dating can, in fact, prove that the image is Jesus. The problem is that the "chain of custody" was broken. So, science is a dead end, here. It can only debunk. I suggest you look at what the church says. Its standards are very rigorous.
I understand that any dating, even to the 1st century would not necarily prove it is Jesus' Shroud. But I think the circumstantial evidence narrows it down pretty tight.
I respect the churches authority and competence, but I still feel like scientific standards of evidence are a bit different in that it looks solely at natural evidence that can be replicated, unlike, say Fatima.
So it is a tougher arena, and it intrigues me that the evidence thus far seems to point at something unnatural occuring - ie the tomb was emptied within a few days of JEsus' burial or the Shroud would have decayed.