So I just played through the campaign a second and third time, and I just wanted to share a few speculative thoughts that very well may be very off, but hey, what the hell.
With each playthrough, I kept getting the feeling that the events of Halo 4 were specifically planned. I know that the Librarian mentions that she planted the seeds, and I'm not saying that it was planned that Chief and Cortana float in aboard half of the Forward Unto Dawn, by the way. It just seemed too convenient that of all planets to stumble upon, it would be a Shield World that the Didact was chilling on. It seemed to convenient that the Infinity was close by, close enough for the Didact to capture the signal and manipulate it so that it would appear to be coming from the center of the planet. That Chief and Cortana would just assume that a big glowy orb must be a signal relay.
I suppose what I'm saying is it almost felt as if someone or something was pulling the strings, ensuring that the events of the campaign occurred in the manner that they did.
Am I crazy? I'm probably crazy.