Locke Dead??? No way!

I'm not buyin' for a second that Locke is dead. We're talking about a guy who fell eight stories, and lived - recovered from a broken back, and kicked that one-eyed Ruskie's ass twice. It'll take more than one to the gut to kill John.
Here's a link with processed images and a slow-mo of the frames where we can see Jacob:

http://losteastereggs.blogspot.com/2007/05/11-frames-of-jacob.html

One comment on there suggests that it's Locke with a beard and hair. Could be.
Did anyone else think it was lame that, when confronted about Juliet's tape, and, after revealing that he knew the Others were about to attack, Jack just says, "Well, I didn't know what I wanted to do about it." Is everyone just supposed to accept that? I would have Jack and Juliet chained to a tree and gagged by now.
I was amused to see Ben's Dad (Roger Workman) played by Jon Gries, who played Lazlo, the weird guy who lived in the dorm room closet in "Real Genius", the 1985 comedy with Val Kilmer. I admit it. I love that movie.
So, do you think killing your father is recurring theme in this show yet?