Just a note: all BBW generate slurry when used on water only at least a bit. I have used all the blue sides on my coticules (I have four, one with an unusable coticule side) in different progressions similar to Rod as well as finishing and from start to finish (after setting a bevel on something else, dulling it, then re-establishing the bevel on the BBW), with varying succes but mostly very good results. For the finishes: they are nearly identical to coticule finishes.

It handles similarly to a coticule, although not quite and there is some (yet minor) difference between different BBWs.

You can use it next to coticules (or other hones I guess, although I wouldn't know where to insert in a synthetic progression as I have never used one), instead of coticules or as finishers. I personally have found them to be as useful as coticules, although a bit more finicky (as they generate slurry).

However you look at it, I sadly still see it defined as having 4k grit properties on SRP and nothing else, which is a gross misrepresentation of its abilities.