Obito simply hasn't gone after him, the guys isn't even really trying.For those who think Obito can beat Madara, don't you think that if that was true, it would've happened along time ago by now. O_O If Obito or rather more specifically Rikubito, could solo Madara and probably kill him within seconds, then we should've seen it happen as soon as he became the Jubi's perfect jinchuriki. hmm I believe, current Madara > current Obito.