Undercover,
You write:
“Yes, if the JW chooses to do so based on what he reads in the Roche letter. But, really, how many dubs know about that letter?”
Few Witnesses know about the letter, but lots of Witnesses have access to Watchtower’s policy that Witnesses can accept all fractions of all components of blood. If Witnesses can accept all fractions of all components of blood then Witnesses can donate all fractions of all components of blood. Unavoidably that is Watchtower policy, and any Witness who needs confirmation of that conclusion need only phone or write Bethel.
More than a few Witnesses have discovered this upon close scrutiny of Watchtower’s blood doctrine and concluded the above. For these, Watchtower's doctrine regarding blood donation is self-evident. This is the basis upon which they can choose to donate blood and not hide the fact. If, as you suggest, when local elders learn of this donation they invite the individual to a judicial hearing, they have no need to cite the Roche letter. All they need to do is cite Watchtower doctrine that Witnesses can choose to accept all fractions of all components of blood, and it is on this basis that they chose to donate all fractions of all components of blood. They can take it further and invite those elders to phone Bethel before making a stupid mistake that will be overturned on appeal. It would be overturned on appeal because Watchtower does not need to read the Cliff Roche letter to know is its own doctrinal position.
Marvin Shilmer
http://marvinshilmer.blogspot.com