Almost Joe, Almost.
A few terms first.
Tsubo-Sumi = Sumi on a white Ground.
Kasane-Sumi = Sumi on the Hi.
Miseba = Focal Point.
The sumi pattern on a good Sanke must have a focal Point. A Miseba.
Tsubo Sumi is held in high regard.
Tsubo Sumi that appears as The Miseba is Kata-Sumi.
So basically A Bold Tsubo-Sumi on the Shoulder is Kata-Sumi.