Bingowings said:

Tone is something Lucas doesn't usually do well.

So his 'tone shift' reshoots don't fill me with optimism.....

As it is now his reshoots this far down the line might now be seen as him meddling with what has now become someone else's work.

Those were my first thoughts exactly.

It reminds me a lot of his go-off on Kershner - "you're ruining my movie" - and how he then re-edited Empire. A cut that I believe was later scrapped because it didn't work. I may be wrong.