Honestly, as much I hate to suggest they go about it this way, I think they should fix up what they have then start fresh on a 'Season 2' version, seeing as the WW cell scenes should wrap up the original lineup's content. This way they can move the story forward without having all that pesky previous content just getting in the way and breaking itself. I'm typical not a fan of when games do this, but in this case it would fit the setting and, fingers crossed, maybe the time used to fix bugs can then be put towards learning how to Unity and optimize the game a smidge (let's face it, the fact this game takes 10 gigs of space is a bit much).