[Rias]

Nothing out of the oridinary...they do have to explain about the truth behind all 5 year's incident, and of course the pieces that leads up to them.

Only one thing I thought they would skip was

Spoiler for Kakera Musubi:

"A New Wind", and the pieces leading up to that. Personally I don't find all those talks to be as important as revealing the truth behind alot of things. Most of them are just to reinforce the importance of Keiichi, but we already have seen that in Minagoroshi-hen.

Only thing that's important is probably the piece where Hanyuu and Rika were playing in the fields to get Ichiro's attention...