Primarily, yes. Sometimes the value changes anyway, because a bright yellow is lighter than most other colors, but primarily that was one of his innovations.
For those who don't know what Sam and I are talking about: value is just the light and dark property of colors. Colors have 3 properties: hue (what the color is, blue, red, etc.); intensity (how bright the color is: bright green vs. a very light or very dark green, which have usually been diluted with other light or dark colors); and value.
I'm curious who you might think were the best draftsmen of all time. I'm sure Michaelangelo would have to be included.
I'm more interested in color rather than line. But if I had to note great draughtsmen: I'd have to say many of the Renaissance artists: Piero, Raphael and yes, Michelangelo. I just love how he creates tension. In the 19th century: Ingres was probably the last great draughtsman before the camera was invented. Daumier was also great; a great loose use of line.
Michelangelo, study for a Sibyl for the Sistine Chapel, Ingres Artist's Wife early 19th century and a lithograph by Daumier, mid-19th century. Notice how loosely done the dress of Ingres' wife is and how Michelangelo has worked various images into one sheet. Daumier defines character and anatomy with just a few, loose but right-on lines.
Of course, paper only came into general use in the Renaissance, so records of drawings before this time are very scarce.
Colorists: Turner and Rothko top the list.
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A large painting by Rothko; the layering of his colors is awesome.
I can't note just one artist as my favorite. Each artist has too much to offer. I have reams of artists I just love, from each period.