Yeah a knot with one string definitely would not make sense, LOL. I don't take my thread through the bow. both ends of the thread go through both slits in the GB. I then do the half knot and bring the ends back through and so on. Sorry I didn't read that someone else did it the other way or I would have clarified for you
Overall all ways mentioned work great, it's just a matter of finding one that works the quickest for you. KWIM?