Board Thread:Game Updates/@comment-3502824-20170829010745/@comment-2014227-20170912135724

Unless they changed the improvement schedule for the Wildcats you can't get Hellcats through upgrading if you've remodeled Sara to Kai Ni. She only improves Hellcats today.

So it's entirely possible they pulled a massive dick move and you need to get a second Saratoga to keep at Kai just to be able to do that.