I suspect A-man means to fix all the errors of the scene by keeping all the original intentions of the filmmakers.
Like harmy said about the 3 frames but the sabers are animated for every frame, maybe there is the problem that needs to fixed without ruin any originality or artistic decisions at the end. Since ady already re rotoscope all the sabers in ESB why not take the extra bit of the time to make the good-->better.
-Angel