when you are just singing, it can be nice to have more than 2 or 3 verses, but "Bully in the Alley" was a 'short haul' chanty, used for short, intensive jobs, and didn't come with extras. As we see, a few people have added some that seem to be 'in the tradition', but it started out as with only the three, with one switched to 'chorus' as it became a performed song instead of just a work song.