Who is the foul-tempered old sea-dog who rolls up at the "Admiral Benbow" inn, and what's he so afraid of?

The arrival of a sinister blind man brings death to Captain Bones. Not long after, Squire Trelawney has a great idea.

The sea-cook hired for the "Hispaniola" is all affability to Jim Hawkins - surely he can't be the one-legged man Captain Bones was so afraid of?