In the latest chapter where Obito is using Mokutun, Zetsu says it was no wonder why Madara 'chose' him. We know that Obito managed to survive the boulder and and the Zetsu's retrieved him and took him to the liar. My question is when did Madara 'choose' Obito. The way the previous manga chapters made it seem like it was all coincidence and not planned at all, especially considering Madara didn't know how Obito manged to survive the boulder. However, If Madara did choose Obito before the crush, he's not much of a master planner seeing as he didn't even know Obito would survive.
Is Madara a dumbass? Thoughts?