To quote the post: while you could, at a later date, fold groups like the Road Wardens or Sewer Jacks into the Watch, they would act as a special branch of the Watch rather than something the mainstream Watch can do. This is a unique opportunity to create a second purpose for the organization that it can perform just as well as the first. They will not have this capability immediately, of course, but the goal of being capable of it will be written into their founding document.
If you take the Sewer Jack option, it's not just bringing the Sewer Jacks onto the watch payroll - it's creating an organization that patrols the undercity with the same skill and tenacity as it does the streets above. You could, later, bring the Sewer Jacks into the Watch, and they'd continue to patrol the sewers, probably a bit better now that they've got official backing, but they'd never achieve the level of manpower and dedication that taking this one-time opportunity would result in. The same applies to the Roadwardens, and the River Wardens, and all the other options.
This is a one-time deal. It is very unlikely you'll get another opportunity like this to build a dual purpose into the very heart of the Watch.
If you take the Sewer Jack option, it's not just bringing the Sewer Jacks onto the watch payroll - it's creating an organization that patrols the undercity with the same skill and tenacity as it does the streets above. You could, later, bring the Sewer Jacks into the Watch, and they'd continue to patrol the sewers, probably a bit better now that they've got official backing, but they'd never achieve the level of manpower and dedication that taking this one-time opportunity would result in. The same applies to the Roadwardens, and the River Wardens, and all the other options.
This is a one-time deal. It is very unlikely you'll get another opportunity like this to build a dual purpose into the very heart of the Watch.