You misrepresent Howard, because he presents it as a hypothesis, whereas you say he "obviously" believed it. I already addressed this comment of yours. Your use of obviously is as hollow as Watchtower's use of clearly when they make a comment that has no support.
Would almighty God have allowed this group of Christians to champion his name at this crucial time if they did not enjoy his blessing and support?
The reason this can never be a big issue with JWs is because of the "elephant in the room." If using the name Jehovah is a requirement of salvation, Jehovah would not have allowed it to be removed. At the very least, in "this crucial time" of the last days, he would have allowed some NT fragments to be found with the Divine name. If over a century after the last days started there has not been a single fragment discovered, and nothing more than a handful of lone scholars hypothesising about this theory, it cannot be of any importance to Jehovah at all.