I understand, WT, that Rutherford's ONLY source is the Bible, is that correct?
If so then there is only one source -- the Bible.
There is, then, no need to go through anyone else. The statments that the Bible makes need to be examined and better reasons for an interpretation than "he says so" have to be given.
You may give Rutherford's reasons for his choices. Only the validity of those reasons are worth a thing. His saying so doesn't matter to anyone.