“Even if bits of the body and blood were believed to be present there in the cloth”
Consider that even all evangelicals acknowledge that Christ ascended bodily to the right hand of God, so that One of the Three Persons of God actually has a physical body — somewhere, we don’t know where, and He will return. He is Christ in spirit and flesh, even today. So his Blood remaining here on earth is significant — it is in a sense still part of Him.
You could make an argument that his Glorified Body doesn’t concern itself with lost blood, just as we aren’t when we give blood.
And did He gather all the bits up upon resurrection... we don’t have enough evidence to say no or yes. It seems the Shroud is rather clean, not gummed up with stuff, though some could be explained by bacterial consumption.