The issue with the Orphanage twist for me is that it doesn't go anywhere, it just creates a new dynamic with Edea, but it really doesn't add anything to the characters; and the whole GF memory wipe elements in the plot is never spoken of again outside of one diary entry by Selphie, and one comment by Squall. It's just kind of there to be a twist that never goes anywhere. It would have been more interesting to get more scenes where the party reminisces to each other at later points or try to rectify long ago feelings like Irvine's crush on a clueless Selphie, or they could have really shaken things up and have more interesting dynamics change like what if Seifer and Zell were best friends and Quistis and Squall were close as kids but now are different due to the GF memory wipe wiping out those memories? It's just never mentioned again after this event in any meaningful way. Cloud's twist is integral to his character, but I don't feel the same can be said of Squall and Co. The plot-twist could be dropped from the story, with an alternate explanation about Edea's identity, and it really wouldn't have wrecked any major dynamics in the game. That's my issue with it, its just a twist for the sake of atwist ultimately and it didn't have any real impact on the plot.