Who is Willie Heinz from The Risk Pool and what is their importance?

Willie is Drew's friend and is not a very bright guy. He joins Drew's organization to terrorize rich people. Ned always associates Willie Heinz with flight. He is a coward and is best at running away. He is tall and has a sprinter's build. Willie disappears the same day Jack Ward dies. Ned finds out much later that he probably drown in the white Lincoln that he and Drew stole. The car belongs to Jack Ward.