So, a note on timing. Horace claimed he had been dead for twelve years. Which would make the Dharma massacre twelve years ago. But we know that Alex was 16, and that Rousseau claimed that Alex was stolen from her just after she was born. And I assumed that Ben's coup would have had to have happened before then, because it's hard to picture him secretly raising a daughter behind his father's back. Which would place Horace's death sometime at least 16 years ago. So it seems to me there are three options. Perhaps Locke's dream (or vision) is just unreliable, at least when it comes to time. Or it could be that Alex actually lived with Rousseau in the jungle until she was 4 or 5 and wasn't taken by Ben until then. (But I would expect her to have had some memory of her mother if that was the case). Or Alex was stolen as a baby, but was being raised by the other Hostiles while Ben was still part of the Dharma Initiative. But then why wouldn't Alex think of one of the others as her father? (And each of the last two possibilities would require Rousseau to have lived on the island while the Dharma people were still there, which strikes me as unlikely, in part because it would mean that Rousseau hijacked he Dharma radio tower while Dharma was still going strong -- I would have expected them to repair something like that.) I guess the last option is that there's some kind of crazy time travel thing going on.