So after this battle a lot of things came clearer.
It is not that Sasuke didn't kill Oro but rather that he couldn't kill Oro.
Sasuke is a smart guy, a guy who lived with Oro for a long period and got to know everything about him.
Sasuke knew that killing Oro was almost an impossible task, a task that would drain him and most probably put him in a hard position which Oro could have taken advantage of.
So Sasuke did the next best thing, he engulfed Oro, or in other words he possessed Oro instead of the opposite happening. This had many advantages, Sasuke got all of Oro's power and technique as well asw he got Oro under his control...but like Naruto/ Garaa/ and any other Jinchiruuki, this had a disadvantage...just like the Kyuubi and Shikuku, Oro waited for the chance to come out and take control.
Sasuke believed Oro to be weak in that respect and never believed it would come to that, or he knew but took the risk anyways since he wanted to kill his brother so much.
After all is said and done, it seems that Sasuke absorbed Oro and didn't kill him simply because he couldn't.
What does this make of Oro?
Well first, it tells us that Oro anticipated Sasuke betraying him and trying to kill him, and he prepared accordingly, he almost accepted being absorbed by Sasuke without any real fight, a fight that made many fans wonder why Oro was beaten so easily.
Oro, a genius just like Sasuke, Knew that there was no possible way to take over an Uchiha face to face, after all he did try that in the past and it was a complete failure.
So what did Oro do? he planned for this, he accepted being under Sasuke's control until the right moment came, and that is what we just saw the past few chapters.
Oro's behavior does seem to resemble Bijuus, which makes one wonder whether he really is one, or a self made one as was posted in some other thread, we might find out in the future.
It is not that Sasuke didn't kill Oro but rather that he couldn't kill Oro.
Sasuke is a smart guy, a guy who lived with Oro for a long period and got to know everything about him.
Sasuke knew that killing Oro was almost an impossible task, a task that would drain him and most probably put him in a hard position which Oro could have taken advantage of.
So Sasuke did the next best thing, he engulfed Oro, or in other words he possessed Oro instead of the opposite happening. This had many advantages, Sasuke got all of Oro's power and technique as well asw he got Oro under his control...but like Naruto/ Garaa/ and any other Jinchiruuki, this had a disadvantage...just like the Kyuubi and Shikuku, Oro waited for the chance to come out and take control.
Sasuke believed Oro to be weak in that respect and never believed it would come to that, or he knew but took the risk anyways since he wanted to kill his brother so much.
After all is said and done, it seems that Sasuke absorbed Oro and didn't kill him simply because he couldn't.
What does this make of Oro?
Well first, it tells us that Oro anticipated Sasuke betraying him and trying to kill him, and he prepared accordingly, he almost accepted being absorbed by Sasuke without any real fight, a fight that made many fans wonder why Oro was beaten so easily.
Oro, a genius just like Sasuke, Knew that there was no possible way to take over an Uchiha face to face, after all he did try that in the past and it was a complete failure.
So what did Oro do? he planned for this, he accepted being under Sasuke's control until the right moment came, and that is what we just saw the past few chapters.
Oro's behavior does seem to resemble Bijuus, which makes one wonder whether he really is one, or a self made one as was posted in some other thread, we might find out in the future.