Well it's plausible I suppose, but extremely unlikely on the grounds that Emily Linus apparently died in childbirth, and I can't really see how they could realistically write their way out of that one, and that Emily Locke, who is a DNA match to Locke according to the PI he hired, is alive and kicking at least as far on as 2004.
So it's a strong no for me, but you never know, I guess.
Welcome, by the way.
