Originally Posted by Wolverine
Obito went from a totally useless fuck before he died to a raging beast when he slaughtered the mist shinobi. Now we don't know how many shinobi were present before he arrived on the scene, but once he snapped, he slaughtered them rather effortlessly, using his Mokuton abilities and usage of Kamui.
Obito's use of Kamui allows him to traverse large distances instantly. That can be attributed to Kamui. It's just an ability he has and can use it. Though him being that adept at it so soon is questionable. BUT, when you consider all that Madara taught him, it is not so far-fetched, considering Madara himself is a master of OP ass-pulls... and this when we still haven't seen all he has to offer.
Let's revert to the fight. Obito controlled Kurama with the Sharingan. How he managed that is something I don't have the answer to. It seems implausible and that is where I'm guessing that Madara's teachings have something to do with it. He might have inherited Madara's power or some abilities. We don't know. Though that seems to be the only logical answer.
As for fighting Minato, he really did nothing much. Using Kamui to travel long distances is something is different since it's something only he can do. Minato only exchanged a few blows with Obito (tried rather) before he figured out how to defeat him. Once the Rasengan attack landed, Obito fled the scene. It's only thanks to his intangibility that he survived. Otherwise there was nothing special about that fight. Minato would have been able to summon himself to this dimension even if he had gotten sucked into that dimension, so the result would have been the same.
...how exactly are you arguing against me? You basically admitted everything you originally stated was far more difficult to comprehend than you originally thought. In ~13 months Obito went from a fuck up that had just awakened his Sharingan, to taking complete control of Kurama AND fighting with the deadliest ninja in Konoha (at the same time, no less). There are no logical explanations for that amount of development. Even with Kamui's assistance, there's no way he could be able to fight on even footing, even for the short duration it was, with a guy that was given a "Flee on sight" order by every other nation.
By the way, this:
Minato would have been able to summon himself to this dimension even if he had gotten sucked into that dimension, so the result would have been the same.
is pure speculation/fanning on your part. You have no reason to believe Minato could teleport out of the dimension Kamui uses. We don't know anything about that dimension. As far as we know, the only ones with access to it are Kakashi and Obito, and Obito is the only one that has been shown capable of bringing anything warped into it out.