Time for some good old TLK discussion

I'm wondering, why when James Earl Jones forgot his line "brother" and they covered the cue with claw scraping, why they couldn't just record the line again and put it in the movie, rather than put it in with an error? Surely it wouldn't have been too hard to cut and paste in a bit of audio, or was it that they thought they could get away with it and didn't see a need to redo it?

It just seems odd to me. Thoughts?