Basically as the proclaimed "G**" said she would make Shirone as another G** to create the Matrixes, I think she is also a pa** that has been instructed the same too and she chose Shirone as the next candidate to become a "G**".
So I think the real one who's behind all this endless loop is what we called "The One True G**".
So I think the real one who's behind all this endless loop is what we called "The One True G**".