Interesting details - wasn't aware of it. Would love to read up more on this. All I know is that, they didn't produce a lot of conquerors/emperors (unlike the west that produced Shashanka, the Palas and the Senas - among others) and that the Brits populated a lot of remote corners of the erstwhile East Bengal with migrant laborers.
I am of mixed origin (50% ghoti and 50% bangal). My father is a direct descendant of an erstwhile zaminder dynasty appointed by the Maharajas of Krishnanagar - basically as ghoti as it gets. My mother is of Bangal origin.