Expandedly the counselar is best represented by Qui-gon and episode 6 Luke("I want to talk and convince you that the path you walk is incorrect, but don't worry I can back it up with my knowledge of the living force.")
The KotOR system was dropped after their fall as all Jedi had to be capable in most if not all skill sets, additionally the sentinel fell out of the regular rolls, and finally the populace belief that yellow was close to the red of the Sith, due to the population at large believing that sith and jedi were two sides of the same coin.
Some Jedi leaders have carried the purple blade as Mace windu carried(but please note that Sam L Jackson requested the purple blade just because he is that pimpin), but not all as some in various eras carried blue or green or even orange and silver.
All information given is based mostly by memory of years of playing star wars rpg, KotOR, Galaxies and possessing a good number of books, comics, and a compliation of the late 90's mail group text (I have been *fwzooked*, arrrggh) but not touching them in the last 3 years. God I need to geek out.