Nope, that guy was probably either lying or confused. I've had non-expiring tickets from a prior trip that I was using for the Water Park & More options, and tried to put them on my current room key and was told no, twice, that they can't put a previously used ticket onto a room key. So, I had my old expired room key with the water park admission on it, and my current KTW card with my admission tickets and room key. To confuse things even further, on my most recent trip I had my Annual Pass, my expired KTW card for water park admission, and my current KTW card for my room key/charge card. I tried very hard to keep everything organized in my pockets, but I'm sure I caused a few eyerolls as I sorted through all the cards. I did make sure to sort through BEFORE hitting the turnstiles, cash registers or FastPass machines, though!