The first person Kakashi meets when he staggers out of the house, covered in blood, is Uchiha Obito.

Nie Huaisang thought that - should the time travel array actually work and he end up back in time before everything happened, with his brother still alive and well - that the first thing he would do would be to properly weep and cry and hug his brother, not jump straight into explanations and strategizing. Then again, he hadn't expected that the array would somehow send his spirit into his brother's body, casting his brother's spirit into his own past self, either.