My dad blocking the internet with his work really choose one of the worst times ever to do so. You finally get to go online and then... this. Do you guys even notice how much you write at times? D:
Err, anyways. Somehow, I can't help but not really feel like Shima is a spy. Just, like, not completely. It's almost as if I did accept it into my head but my mind won't wrap around it. Because it just seems to have so many loose ends hanging around right now.
"Oh, that huge-ass familiar? Yeah, I could always use that. Just didn't feel like it", and the sudden boost of fighting-skill are the things that throw me off the most in this whole scenario.
As everyone has already said at least once, in the IK-arc, he and Konekomaru were in a pretty tight situation. And maybe he didn't use it then because he could think far enough to not use it for he would cancel Rin's flames in case he did something. But that seems highly unlikely.
And with that apparent amount of fighting experience... hell, his older brothers seem kind of weak in comparison to him, with Renzou just doing a Naruto-style jump out of the blue. While never setting down Izumo at that. Which I, personally, don't understand. If Takara was focused on him, then it probably would have been a lot safer to set Izumo down so he wouldn't wave her around all the time. Like he didn't entirely care about her getting hurt. Or sick to her stomach.
Somehow, I believe that he couldn't have been trained a lot, though. I mean, him, Bon and Konekomaru were pretty much glued together by their hips since they were little. Those two are smart enough to notice if there was something fishy going on with their friend. Like, a double-identity. Even living in the dorms, they'd wonder where Renzou went if he were away all the time. Unless he did it at night. Everyone always does everything at night.
Also, he simply knocking Izumo out in the end because she wanted to fight on her own... it doesn't quite make sense to me. Izumo thinks of him as an ally, at least. So it would have been to his benefit to have her fight alongside him, which would even wear her out and make her easier to take care of. But instead he pulls that.
Which made me think the following: In the beginning he thinks about notifying Shura. He doesn't do that, but if he had had more time, I believe he'd actually have done that. So he went about, protected Izumo and caused a huge-ass ruckus that would make the others pay attention and go there. Maybe, along those lines, he caught up on what the situation was and put up a façade and acted as the spy so he could save Izumo's butt. Because he digs her. Though that familiar still doesn't make sense.
So, yeah, I will just be over here, pretending that I wasn't naïve- go ahead and prove my every point wrong, or else I'll feel like I went overboard with my shipping.
... Alternatively, how about an evil split personality? I mean, that's a common thing in manga, right? And if they don't come from ancient Egyptian artifacts, a mental strain makes them appear, too. Like responsibility.
So the evil schizo-side might be the spy? And it jumped at Renzou trying to protect Izumo, took over and summoned up the demon. Which would be why Renzou never used it. Because he doesn't know it's there. Or... something.
So, yeah, too much Yugioh in the last weeks.
Poll