This should put your mind at ease. We were originally a party of 6 for our Feb 2-10 trip. My BIL and SIL are not coming with us now, so I caled Disney Dining to change my ADRs from 6 to 4. The CM told me I didn't have to change, since the tables are reserved for 4-6 people. It sounded a little strange to me, but I took her for her word. I am just going to tell them when I check in that we are now a party of 4.