OOO nice blade!
The coarse Central Asia, fine India theory is not full proof. Also you can make a coarse one finer, but you can not make a fine one coarser. Also, forging plays a part as well as individual craftsmen. It is just that with the little evidence we have (a few ingots and crucibles from archaeological sites in India, Sri Lanka and Central Asia), we see differences in the microstructure of the ingots due to solidification rates.