Would like to raise two points.
1. Has anyone theorised (sorry if I have missed your blog) or have any ideas how the two timelines are going to come together at some point?
My initial thought when Flocke said to Sayid 'what if you could have anything you want in the whole world' (presuming he is telling the truth which he is just as likely to not be) was some sort of reference to the alternate timeline
2. I have absolutely no idea how this could happen, or would happen, but I still think that Locke will be the one who 'saves them all'
And whilst I dont agree on any level, did anyone in the UK read the blog in todays Guardian newspaper about evidence growing that the Island is in fact purgatory?