Ghwara Margha

Pashtuns have the tradition of having origin in some Ghwara Margha. Can it be Murghab-river valley in Ghur where river Murghab originates and flows through. Remember that Pashtuns also have strong trafition to have originated in Ghur. Is it safe to speculate that Ghwara Margha contains in itself the derivatives from both Ghur (Ghwara) and Murghab (Margha)?