Okay, I want to get back to the Dark Space Invasion Hypothesis that was presented on page 743. The more I think about it, the more I like it. Opening the citadel relay and traveling to/destroying the reaper home/base/whatever would be a simple yet elegant way to wrap things up without using any

. Moreover, it would present lots of different opportunities for confronting Harbinger or seeing the consequences of your choices. For example, maybe if you saved the rachni queen she and her forces will volunteer to hold off the reapers while the rest of the fleet blows the relay and escapes before it closes forever. If you didn't save the relay, maybe Hackett has to stay behind. Something like that.
I still like the idea of the Crucible being a trap or a distraction, but if it has to have a useful function, opening the relay to dark space is the best idea I've heard yet.
Here's something to ponder: Assuming that DSIH is true (yes, I realize we don't have any kind of evidence whatsoever to assume this yet), does TIM know what the true purpose of the Crucible is? And if so, how does this fit into his plans to control the Reapers? Does he want to travel to their base, use his new reaper-controlling skills to somehow take over the place?