Does Obito master the Summoning Jutsu?


I've seen the recent episode of the anime, and I saw when Obito summoned
Kurama. I'm interested in the fact that does he get into some kind of
"contract" with some animals/things? (That would mean that he is really able
to summon.) I've checked on the Narutopedia, and it appears only the Gedo Mazo
is attached to his name, so is the summoning of the Nine-tails just a
normal/simple summoning technique? Because you must have that kind of bond
between you and the summoned animal, which is made with your chakra/blood,
just like Naruto did with the toads and it would be weird if you would be able
to summon a tailed beast just "because".




From the the battles of Minato vs Obito and Hashirama Vs Madara I can
recollect **three** important things:-

  1. Both Sharingan users[Obito and Madara] casted genjutsu to Kurama[Kyuubi] and as a result they were able to control it.Kurama was bound to obey them
  2. There was some contract seal between the caster and Kyuubi.
  3. Both Minato and Hashirama used their contract seal.

More about **Contract Seal** is explained
[**here**](http://naruto.wikia.com/wiki/Contract_Seal):-

> Though the Contract Seal removes the summoner's ability to control its
> summon, it does not give the user of the fūinjutsu the ability to control
> the summon in turn.

From what I can speculate Obito got some information about the contract seal
from Uchiha tablet or directly from Madara.




From the the battles of Minato vs Obito and Hashirama Vs Madara I can
recollect **three** important things:-

  1. Both Sharingan users[Obito and Madara] casted genjutsu to Kurama[Kyuubi] and as a result they were able to control it.Kurama was bound to obey them
  2. There was some contract seal between the caster and Kyuubi.
  3. Both Minato and Hashirama used their contract seal.

More about **Contract Seal** is explained
[**here**](http://naruto.wikia.com/wiki/Contract_Seal):-

> Though the Contract Seal removes the summoner's ability to control its
> summon, it does not give the user of the fūinjutsu the ability to control
> the summon in turn.

From what I can speculate Obito got some information about the contract seal
from Uchiha tablet or directly from Madara.

