In earlier models, the northwestern regions were the source of the so-called movements of Indo-Aryan speaking peoples. Yet, if there were such moveme… - Jonathan Mark Kenoyer

The significance of these similarities or dissimilarities should not be taken too seriously since the biological anthropologists themselves caution that this is only a tentative suggestion due to the small sample size of the Late Harappan burials. Generally speaking, the biological evidence does not support any hypothesis involving the movements of new populations into Harappa from outside the Indus Valley during the Harappan or Late Harappan periods.

During the Harappan Period (Harappa Phase, 2600…1900 BC) there was a dramatic increase in terracotta cart and wheel types at Harappa and other sites throughout the Indus region. The diversity in carts and wheels, including depictions of what may be spoked wheels, during this period of urban expansion and trade may reflect different functional needs, as well as stylistic and cultural preferences. The unique forms and the early appearance of carts in the Indus valley region suggest that they are the result of indigenous technological development and not diffusion from West Asia or Central Asia as proposed by earlier scholars.

There is no archaeological or biological evidence for invasions or mass migrations into the Indus Valley between the end of the Harappan Phase, about 1900 B.C. and the beginning of the Early Historic period around 600 B.C.