I personally think that Madara and Obito are connected still. They may not be the same person, which I do not believe anymore...but it seems that they may have the same Sharingan. Maybe Madara came across Obitos corpse and managed to get his sharingan because his own was damaged? When you think about it..it kinda makes sense. This is because Madara has shown the ability to teleport, or send parts of his body to a dimension and bring them back, as stated by Kakashi. Now Kakashi can use Kamui, which sends an object to another dimension. It seems these 2 jutsu are related, and the only reason I can see why is because they stem from the genetics of the same Sharingan User. I think the MS has different abilities outside of Amaterasu, Tsukiyomi and Susanoo. I think the abilities depend on the user and maybe the MS has around 20 different abilities, and whatever ones you get are random. So Kakashi/Madara have jutsu that involves traveling through a dimension, and Itachi/Sasuke has jutsu that revolves around Ninjutsu, Summoning, and Genjutsu.
*Edit*
Nevermind what I said about him taking Obito's eyes cause his own were damaged, Madara has claimed the eyes were his in a few statements. such as the "former glory statement". I however think that his jutsu and Kakashis are a pair.