I think he can't see the trees for the the forest though. The Jews (and perhaps all people, at the time) thought blood to be precious in a way that is almost indescribable. Blood held life, life held blood. It wasn't only valued, it was loved.
If you saw The Passion of the Christ you'll remember that scene when Our Lord's Blessed Mother is frantically trying to collect his spilled blood. To let his blood trickle away was unthinkable. I know that it's just a movie, but I think it's based on how the Jews of that time viewed blood, to say nothing of the Blood of Our Lord.
At least that's my thinking, Full Court. I do want to say though that I don't know how any priest, pastor or preacher can elaborate on the Faith day in and day out, and not at some point venture off into what many would consider heresy, without any intent to do so. I would hate to have to come under that kind of scrutiny in my own life.
I think you are quite right about the preciousness of blood to the Jew. And the scene from the movie is a wonderful, very touching one.
I also like the hymn, . . . one precious drop . . .
It will be interesting if Wyatt's claims end up true about a crack in at the base of the central cross hole in Golgatha and blood dripping down through that crack onto the Mercy Seat of the Ark of the Covenant in it's hiding cave.