User blog comment:TheCarrotSaysYumYum/Why Lisanna is Fairy Tail's worst character~/@comment-1839664-20140105091858/@comment-7418318-20140105105015

Tbe problem is that any change to Elfman and Mirajane (more energetic ect.) could also have been achieved by the scenario Carry suggested in which they find closure to their sister's death by learning that another Lisanna exists in Edolas, who lives happily with her siblings and re-affirming that as long as they keep carrying her in their hearts, even their dead sister will always be with them.

While Mira and Elf said words along those lines before to each other, they didn't act as if they were truly feeling them. It's as if they want to believe it, but couldn't. Such a message from the other Lisanna, delivered through Natsu, might have been enough to finally make them truly feel what they were only paying lip-service to before, allowing them to finally let go and move on.

And in this instance the redundance strikes again. We already have several other instances of reunions and similar situations in Fairy Tail (Erza and ToH slaves, Erza and Jellal, Cana telling Gildarts he's her father, Richard learning his brother is alive, probably soon the reunion of Yukino and Angel,...) but this scene with them truly accepting Lisanna's death and moving on would have been unique.

Ultear's situation is in this limbo where we neither know if she's alive, nor how Jellal and Meredy are coping with the situation. Erza doesn't really show much how she feels about Simon's death, but seems to still blame herself for his death, so no moving on yet. Jellal is certainly far from moving in this regard (and any other too, but that's not the topic).

Which leaves only Gray and Ur, but since Ur is still alive in a way, I'm not so sure we can really count that.

I think this finally letting go and moving on would have been far more emotionally engaging than the sibling reunion was. And while there is the possibility that what you said about Elfman and Mirajane having a reduced role due to Lisanna's absensce, I think that's a very small chance. And certainly something that can be worked around with little effort.