A lot of people seem to think this, but its clearly false. Well, for starters we all know that the mangekyuo does let you cast genjutsu and control the 9 tails, but Obito had only 1 eye and it would require a lot of chakra. Moreover, the manner in which this 'control' took place was distinct from the other time the kyuubi was controlled by Madara. In the battle of the vote, madara was continuously controlling the kyuubi's every movement, he never left the kyuubi and when he did, it was no longer under his control:
In that fight, Madara used his mangekyuo(EMS) to directly control the kyuubi. Obito on the other hand left the Kyyubi, to go and fight with Minato. He was'nt directly controlling every single movement, more of a general control and oversight.
But what tech did Obito use?
As we all know, Obito has senju hashirama's cells imbedded in teh left half of his body, so he used this technique. As the combined powers of Hashirama and Uchiha were not available to Madara, he used the Mangekyuo genjutsu to achieve control of the Kyuubi.
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In that fight, Madara used his mangekyuo(EMS) to directly control the kyuubi. Obito on the other hand left the Kyyubi, to go and fight with Minato. He was'nt directly controlling every single movement, more of a general control and oversight.
But what tech did Obito use?
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As we all know, Obito has senju hashirama's cells imbedded in teh left half of his body, so he used this technique. As the combined powers of Hashirama and Uchiha were not available to Madara, he used the Mangekyuo genjutsu to achieve control of the Kyuubi.