jws tend to copy what they see or hear being done at the assemblies/conventions. Almost always the prayers have something regarding their god blessing the GB. jws want to be seem as holy as the GB and their representatives so ape what they do. I remember when the CO used to put a table off to the side of the stage at the circuit assembly facing the ministry school students, so he could give counsel face to face rather than from the row in the front.
Then ministry school overseers starting aping/copying that by putting a table off the the side of the stage in the KH, giving counsel from there (no direction from the GB to do that, just started doing it on their own). Finally, the GB had the COs tell each congregation not to do that any more.
Monkey see, monkey do.