According to Osho, a soul can enter another dead body, but it is pointless: that body was abandoned as unfit, so reentering it has no meaning. Rather than speculating about such mechanics, understand how you inhabit this body. In truth, souls take embodiment according to the 'atomic' program of a suitable womb; purpose lies in right conditions, not reviving discarded shells.
Yes, but it’s like climbing back into a broken toy—focus on living well in your current body and on creating good beginnings, not on reusing broken shells.