Indeed. Always have someone waiting in the wings to take over if a planned menace falls by the wayside. It's natural to have an apprentice in training for the eventuality of taking over, so have them ready if the eventuality is precipitated by the heroes.
And if the players question this, all the better, because then you can quote the line: "Always two there are..."
Try to keep a straight face.
Jabba: So, Jedi... What to do with you?
Luke: You will let us all go. <roll>
Jabba: Save your effort. Mind tricks don't work on me.
Luke: What? How?
Jabba: Now that I'm grown I eat five dozen of these frog-things...
Bib Fortuna: He imports them from some remote swamp planet.
Jabba: ... so I'm stoked with midi-chlorian chaaarge!
Jabba: Since you have necessitated use of my apprentice slicer, he shall first practice on you.
Han: Apprentices... why did it have to be apprentices?
Chewbacca: There's always a master and an apprentice.
R2-D2: Heh heh heh.
C-3PO: Quiet, apprentice.