William is correct, but the real problem lies in the storytelling mechanics. If the bride was mostly silent, ok no big deal. BUT if the bride continues to hog the scene with her cheesy puns and maniacal presence, you have a huge problem now if WDI just keeps it like that. The scene is fairly intimate with the doombuggies and if you have the bride on your left, and Hatbox Ghost on your right... well you need to simplify the scene in order to make it thematically correct. Unlike the ballroom scene, which gives you a large vista to take it all in, the attic is telling this specific story and you need to execute the payoff well.
And no: the excuse of, "it's another detail you can notice when you ride again!!!" does not work. I'm sorry but two attention-stealing payoff characters on either IMMEDIATE side of you after they tell this story is messy and does not fit in with the rest of the specific theatrical nature of the attraction.
If this is confusing, do consider that when Hatbox comes back that he and the bride will be in their original locations. The effect in the intended attic scene was of a spooky attic, lightly adorned in wedding props while "ghouls" pop up and scare passengers. At the end were two characters: on your left, a ghostly bride, her heart beating and glowing. On your right, a groom (Hatbox) whose head disappears and reappears with each heart beat. The effect for both occurs within a mere second, and is simple for riders to immediately "get it". Of course, Hatbox didn't work and was removed.
Now the bride is positioned as a scene-stealer, and if the Hatbox Ghost is just shoved in there with no other tweaks then it'll be a mess. I have faith that WDI is well aware of these issues and won't foolishly shove HBG in the scene like that, but who knows?
I will tell you that if that does happen then Magic Kingdom's Haunted Mansion will officially take the crown for me unless they also install the Hatbox. If they actually DO modify the scene, make Hatbox work and finally rid of all that silly axe dialogue... ok I am totally onboard.