This sounds strange and makes me wonder what the new story line with Rachel and Grace will be?? TPTB have to complete that scene of having them fly off to New Jersey without Danny but I hope that isn't the last we see of them for good. I think the Grace/Danny relationship was a strong part of his story line.
Sometimes I wonder if these casting news bits are blown out of context to gather interest for the new character they are introducing for those episodes.
I agree with you!