Walt might have been smokey when he appeared to shannon. Walt would go, "shhhhhh" and that little boy last night from Eko's past (daniel?) said, "shhhhh" to Eko when he was seeing the men he macheted.

And yes, I noticed that Smokey made a growling or purring like sound when it was just smoke, but when it took form it could even talk (yemi).

Katobe- we saw the Smokey transform from Yemi last night, what is there not to buy.