I'm new to all of this, I've read a lot of blogs today and I've yet to see anyone mention that Locke did not die from his fall. This means that either 1. he didn't fall at all and is paralyzed from some other instance OR 2. Jacob still revives him from his 8 story fall. I feel like this is huge because it means that either Jacob still touches Locke (which we've come to understand to be quite significant) or Jacob doesn't come off the island at all. And of course we arent even sure when the island sinks, so Jacob could easily show up in the flash sideways reality. Something tells me MIB may also show up there in some respect.