monster mash-up

(No "Lost" spoiler -- just a theory.)

Something to think about:

After discovering the episode's script among Nikki's things, Hurley is shocked to learn about Mr. LaShade's deceit and true identity as the Cobra. He describes the Cobra as "this big bad guy" whose identity "has been shrouded in mystery for four seasons."

Mr. LaShade : The Cobra :: ? : Jacob

Perhaps Jacob will be someone we already know -- and when his identity is revealed, we will feel shocked and deceived?

Oh, and check this... but be patient for 00:56.