There is not much to be analyzed. In a cult enviromment the leader will always look up for himself. He would never hesitate to break every rule to save his own skin. This most likely will and should, by definition, extend to health as well. I am sure that if such situation came up, then he would uphold his right to make a choice that fits his consciousness. Even if that means taking blood and loosing his privileges in the process. Although that would speak mountains of the true strength of his faith, many witnesses would probably see this as if Jehovah is cleaning the ranks of the GB.
However, would they or what if they were to be subjected to the same pressure as everyone else is? What if the HLC gets there first and enforces the no blood card. Point is, would there be any situation where his wishes are handled by a third party that bears no consequence on the outcome and have them think "I am at the hand of this nut-jobs who believed everything we ever told them and now my life is in their hands and they are ready to let me die"