They want to make sure the title company prepares the new deed (from resale purchase) the same way as
DVC did when you bought direct so you can keep both contracts under one membership. For this to happen DVC requires all names to be exactly the same on both deeds otherwise a new membership will be created. Both contracts also have to be the same UY.
But the broker should be pulling that for you from the comptroller website unless this is an Aulani purchase.
Also, do some research on these boards on the best title company. There are definitely some to avoid such as Magic Vacation Title (much higher closing costs).