The reasoning on the scriptures that this mob do is just as spurious and crap as the WT/JW stuff. It doesn't mean they are ripping off eachothers ideas necessarily, although the WT are ,as Steve says, following Russells example and stealing ideas quite often.
It was asurprise to me when I investigated various sects some time ago how close Garner Ted's lot and the various schisms are, but it is no surprise, they come out of the same nursery, so picked up similar fairy stories, and never learned how to think, let alone how to read the Bible and reason on what it says.