Because when I called to book through Disney, I told her that my daughter, husband and I were staying, but I only needed park tickets for my daughter and me, that my husband will be off looking at properties in the area and won't be doing parks with us. She said that she didn't need to put him on if he didn't need park tickets. But he WILL need a key to get into the resort room, so I'd need him to have something to get in if he gets back before us. Putting him on the rez automatically counted a park pass for him.