Al Fadi and Dr Jay continue there discussion from  Shoemaker's book Creating the Quran.  They name some scholars  including Montgomery, Patricia Corona and others who point out that Mecca was insignificant and Medina (Yathrib was a small date oasis with few hundred people living there, and there is no mention of Jews living there as the S.I.N. mentions.  They also say that most scholars conclude that the Quran and Islam is not from central Hijaz but from farther north.