There is no merit in defending this, its clearly bug. A Positronic Brain's conscience could not ever possibly in any IC context transfer itself to a brain just by having a head attached. The RP in having that happen may have been interesting, but it was a bug, and is not a feature in any sense of the word. A mechanical conscience CANNOT be transferred to an organic brain just by being near it. If you really, really want this as a feature, suggest a proper method for it, instead of defending the bug.