Oathkeeper might just be Jaime giving Brienne the sword and sending her out on her way to look for Sansa.
In book 3, Lady Stoneheart appears at the very end in the epilogue. They could do that on the show too I suppose, but I think it would make more sense to intro her early this season in order to show Beric finding her and giving her life.
I disagree on ruining book 3 by splitting it, I think that way too much happens in book 3 to really try to squeeze the whole book into one 10 episode season, and it would have ruined it to try to cram it all in. There is still a lot of action to come this season from just the last 1/3 of book 3.
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