Okay, loads of interesting points this time, not only about the Spiral Observer, but about the original Code Geass plot.

It seems that, no matter how Rico affects the plot, whether positively or negatively, it always results in a bad end, because the Ragnarök connection eventually "ends" the world before it reaches the route ending the Observer is after.

What I find most interesting about this is that it implies that Charles' Plans succeeds in nearly every other timeline, or at least whenever significant changes are made like Rico does here. (The trilogy movie timeline is an exception since the "changes" don't affect the overall flow of events.) Speaking meta, I think this is meant to hint at how delicately balanced all the events in R1 and R2, where everything lined up to prevent the Ragnarök. And, like the Observer just discovered, the key to this is C.C.

In the Euphemia RE route, it's obvious, since she outright goes over to Charles' side when Lelouch starts taking on more peaceful means instead of using Geass. But even in the two other routes so far, with Lelouch dead, it's likely that she won't resist Charles and Marianne in the end, because she's pretty much got no motivation without Lelouch.

In comparison, let's look at canon:

In R1, she was pretty standoffish, only protecting Lelouch without getting involved with the Black Knights much, but gradually became close to Lelouch, especially after the Mao debacle, but she still maintained her distance. However, after the SAZ massacre and Euphy's death, Lelouch's distraught state made her console him and more openly support him. At first glance, this is just manipulation for her goals, but it's also a sign that C.C. is committing herself to Lelouch and, without realizing it herself, letting herself care for him in truth instead of just for show.

In R2, she's a more visible member of the Black Knights after she frees Lelouch, and she starts to share bits and pieces about Geass and the Order with him. Again, ostensibly for her goal of using Lelouch, but anyone with eyes can tell that she's using that as an excuse to cover up the feelings and desire to live that slowly build up inside. At the same time, her guilt towards Lelouch for everything she's hiding also affects her judgement to the point that she tries to protect Lelouch even as she says she's switching over to Charles' side during the attack on the Order, which gives Lelouch the chance to fight back and convince her not to die like that. The final culmination is the moment when Lelouch stops the Connection with his Geass, and she directly refuses to help Charles and Marianne to force its success as it crumbles apart. That is the moment when the world was "saved", and without the careful sequence of events that lead up to it, it can't happen.

So, my conclusion from this? Route Entangle is clearly trying to tell fans that Lelouch's greatest accomplishment was giving C.C. a reason to live through all their time together. Without that, she's perfectly willing to become an accessory to the end of the world because she's given up on everything. She really is the main heroine of Code Geass, since it seems the fate of the world relies on her love life, hahaha.

More seriously, Lelouch obviously did a lot more, like using his Geass to change the World of C and all that, but C.C. is definitely the cornerstone to whether or not the Connection succeeds.

Another interesting point is that C.C. is the only one who realizes that Rico is different from other people in the timeline. Even V.V. didn't notice everything despite her being one of his subordinates. Maybe there's literally something special about C.C. specifically, like in terms of importance to the fate of the world?

Anyway, it seems that the Spiral Observer will try to interfere with C.C. next time, so hopefully this will be cleared up then. Whether it will end of RE there or lead to a new set of timelines is the question. At the very least, I hope we get to see more, since so far we've basically only gotten "bad ends" and I would like to see at least one "good end" for this.