One more point to add before I cave in… Luke throwing the lightsaber and then using it at the end is symbolic, but using the green makes his story come more full circle as the last time we saw him use it on screen was the event that brought about his self-imposed exile and the events in this movie. Luke using the green at the end resolves the problems he had even before Rey presented him with the blue. In my mind it would be more symbolic that once Rey picks up the blue after Luke tosses it away, it remains her’s until the end as it symbolizes that she will need to move forward on her own.

I am looking forward to your edit, anything you release will be loads better than what we actually got.