Have you tried looking for a 5 pm reservation for Chef Mickey's with a different party number? On another thread, someone posted that even changing the party times will affect what ADRs are available. For example, I just booked Donald's Safari Breakfast for 2 and the earliest time was 9:05 am. I switched it to 3 people and came up with 8:20 am. It's better to increase the party-size in your search, and maybe just mention that the other people in your party couldn't make it. They can't deny you a seat just because someone in your party can't make it. Give it a try and see if you can perhaps get that 5 pm spot just by changing the party size.