Could Kelvin = Ethan?
I have a few more theories on whether or not this works, but need to think it through a little more to plug in some holes in that logic.
Why not? I'm wondering the same thing.The big obstacle for me is that Ethan was killed only a couple weeks earlier...seems that Desmond has hit solo routine down.
Those are a couple flaws I was debating with the Ethan = Kelvin thing. UNLESS, Desmond himself is still hiding something. There have been many posts/questions in this thread about the bunk beds in the hatch, and the movie said there were to be two people hitting the numbers and "pushing the button".
What if Desmond was actually Kelvin's second? They heard the crash or the fuselage expoding; Kelvin (Ethan?) went out through the newly discovered (from our point of view) exit to investigate; and since he didn't return, Desmond assumes he died (of the disease?).
Desmond could have been inputting the numbers for a while with Kelvin (Ethan?), and even taking turns, doing the same thing every 216 minutes (assuming shifts), Desmond would have the inputting the numbers and hitting the button down pat. And also, maybe he is freaking out now because he has had to do it himself every 108 minutes for a couple weeks.
I'll be the first to admit that there are other questions/problems/flaws to consider, but what they heck? I think this is just as plausible as some of the other theories being thrown out there.