Why tobi is not using rinnegan powers [potential spoilers]
Many people are wondering why Obito is not using hardly any of the rinnegan powers
Shinra Tensei, Ninjutsu absorbtion, Chibaku tensei, animal summons, etc.
I think one of the possible reasons that people are overlooking is: He doesn't have enough chakra.
Think about it, as much as people are complaining that Kakashi is spamming kamui, Obito is spamming even more. Every time an attack phases through him, or he sucks in/ releases someone using kamui, it should take up an incredible amount of chakra. Obito has summoned the gedo mazou at least twice during the war, he used the six paths technique to control large scale attacks from 6 jinchurikis. Its no wonder he can't use the other attacks.
Rinnegan moves are notorious for taking up crazy amounts of chakra (which is why madara chose nagato to give his eyes because of his large chakra reserves).
This raises another question though, why isn't madara using all of his rinnegan moves? We've only seen him use the chibaku tensei and the ninjutsu absorbtion. He should have easily evaded lee's attack in the last chapter but he didn't. Madara has infinite chakra as an edo (it is my believe that while madara has an infinite supply of chakra at his disposal, he can only contain a normal amount inside his body at once, which is why he couldn't make a chibaku tensei as large as the moon for example). If anyone has any theories explaining this, i'd love to hear them.