One of the great questions of SF: when there’s thousands of Jedi largely ruling the Empire in the open and 2 Sith hiding why in blazes would the Jedi want to bring balance to the Force? But the prophecy was right, Anakin knocked it down to 2 of each, very balanced.
Two surviving Jedi masters and possibly a third, Shaak Ti was left alive after episode 3 so there could be a final boss for the video game 'Star Wars the Force Unleashed'.
But video games are no longer considered canon.
Any number of surviving jedi are possible, Kanan Jarrus is a major character in Star Wars Rebels which is canon.
Ha, good one. One of my big criticisms is we didn’t get to see Vader jumping around in the suit killing dumb Jedi by score.
How about this question: Are droids slaves? They sure look like it, custom built slaves.
FReegards