Madara was having a bit of trouble with Obito and Kakashi. At one point they were gonna combine their Kamui to get Obito to safety. First of all, why would Madara throw gudou damas at Obito which would have destroyed both him and the rinnegan he needed to complete his plan. Second he could have used Limbos to apprehend either of them to stop their plan. Madara was being really really careless or plot.