Rand, rather obviously.

Nyaneve is up to two things: trying to save Lan's life, and doing her best to prevent Rand's death. She'd grieve badly for either, Lan more for heart reasons, Rand more because she'd blame herself and see that as a huge failure on her part, and because he's one of her people and she feels responsible for all of them, for all that he's been so unpleasant with her recently she might start remembering Mat as a perfect role model for EF boys soon.

I think this new viewing is simply part of RJ's build up to the "man in a narrow cot (a funeral bier) who is not yet dead but is already believed dead while some grieve and build a funeral pyre outside and others rejoice at his demise already" dream, to the "he who is dead yets lives" foretelling, to the "three in a boat" dreams.

We almost know for sure that the ending of TOM will reunite Min, Aviendha, Elayne and Rand, and it's at an event that launches TG (what can it be but a "great battle"?).

I think RJ just added another piece of the foreshadowing puzzle with the viewing of Nynaeve grieving over a corpse (the same corpse who appears dead but isn't, which is apparent to all the Dreamers, but not to Min - she saw all three women around a dead Rand. Min is the one who never sees Rand as alive, perhaps because as part of a set up by RJ to delay the reveal that Rand is alive. Aviendha will mention the WO's dreams, but Min will say she always saw Rand dead. Nynaeve might feel no life left initially. It could be Egwene adding the weigh of her dreaming thay convinces the women Rand isn't really dead, that Nynaeve must top grieving and go on trying to bring him back.