Lost: Mindless Speculation

Mr. Eko/Echo and Jin are sneaking through the woods and come across a track. Eko knows it's Michael's because The Others don't leave tracks. Hmmm...

Rewatching Everybody Hates Hugo, Charlie is asking Locke about Desmond,
Charlie: Where’d he go?
Locke: I tried to track him, but he didn’t leave much of a trail.

DUDE! DESMOND IS SO ONE OF THE OTHERS!