I also couldn't say whether Carpenter assumed it was a capstan chanty, or if J. Bound told him so. It could be a windlass chanty, too.

In any case, it has what I call the "classic" chanty form—something which is really just an extension or adaptation of halyard chanties. It does not have the whiff of a "random" shore song adapted to work. Rather, it was probably developed with the pattern of a typical chanty.