Stealth, smoothness, sleight of hand, fine tuning, and pass without trace

[le Redoutable]

so can we find classes that rely mostly on Stealth ?

the Thief
the Illusionnist
the Ruler ( or Diplomat )
the Spy
the Cleanser
...

 

[le Redoutable]

so, Speed vs Stealth/Smootness ?
lemme explain :
in Champions 4th Ed there's a stat called Speed, which can vary from 2 to 12;
absolute smoothness is reached upon climbing to 12 SPD, you are present and available at every segment of the Turn, there's no breach in your concentration ( that makes me think of the Sloth ( paresseux in french ) )