What if John has never been a Kennedy. What if in the cabal they are not allowed to raise their own children. It is not only a way to have a permanent way to black mail but also breaks the bond of a natural family. This would allow the "sexual spiritual training" all cabal children must learn without fear of tainting the bloodline. What if JFK's real son, as a small boy, was killed in an accident and that is why he is said to be dead.

There is also an extremely disturbing 2nd choice I will not go into.