Cofty you did a lot of work on this subject. Thanks for sharing.
Couple of thoughts:
Noah was not required to waste blood by pouring it out onto the ground. Noah was only to refrain from eating blood of animals he killed to eat. Also, and not that you've said otherwise, Noah would not have been able to extract blood from a living animal and eat it because he was not to eat an animal with its life (i.e., living).
The thought you shared about blood offered at a Jewish alter taken from an animal without killing the animal is intriguing. I'm not sure I've ever considered the ramifications of that, though I agree with you that such a sacrifice would have had no value under the Jewish system.
Watchtower leverages an idea that the substance of blood was something God held as a sacred substance. We can look at the Genesis account of Noah all day long and not find this. Noah was free to use blood from slaughtered animals to paint his barn or die his clothes and in neither case would he have broken the requirement laid up him.
Another fallacy of Watchtower reasoning is the idea that only after the flood were humans allowed to eat animal flesh, including blood by the way. Watchtower has gone out of its way to keep its followers from reading the very well researched information on this subject.
