Okay...not sure if this will help you but... I just got off the phone with both the CRO and Dining! I spoke to different people at each and here are the results! CRO told me in no uncertain terms that I definitely needed to call Dining and inform them of the changes but that my ressies would in no way be affected meaning that I could keep all of the dates and times I previously had. But that I 100% had to call Dining and notify them! Okay...second call now to Dining... A wonderful CM answers and tells me that it is helpful to call and notify them of the changes but not 100% necessary, "but why don't we go over them as long as I have you hear on the phone with me". Okay now here is where the tricky part comes in, I have paid OOP for all the dinner shows as it was the only way to get ressies and we were going to the Luau, Cindy's Table and Hoop De Doo at the time of ressie I got Category 1 seating for both the Luau and HDD. When we decided to go with the DDP I knew that I could not use DDP for these two shows due to the category 1 seating but we were really looking forward to them and decided we would just pay out of pocket and then have more table service credits available elsewhere. But Cindy's Table I could go either way, remain paying OOP or convert it to the DDP. Depending on the rest of the week would depend on which option we would choose. I have made three ADR's for less popular rest. that I can take advantage of TS credits that are unused or cancel, depending on weather, what we decide to do etc. I was extremely honest with the CM and explained all this to him so he would understand my indecision on whether to apply Cindy's table or the other three ADR's to the plan or not. He told me just to leave them sit as is... there is absolutely no problem. I acn show up at the rest. and let them know I am on the DDP or I can pay cash or I can cancel... it could all be worked out - his exact words "don't worry about it, it is such a little easy thing!" He also went on to inform me that if I had in fact paid OOP for meals and then wound up having credits left they (the charges) could be reversed and applied as TS credits at check out of the hotel or if we applied to many to the DDP we could easily pay out of pocket for one which we had told them would be on the DDP. He had a perfectly happy easy nature about the entire thing. And we wound up leaving the four undecided and he told me there was absolutely no need to call back!
The conclusion I have come to on my own, is that although they would like you to inform them of changes re: the dining plan it is not necessary just appreciated. This theory seems to make reason to the different CM's stories and the variety of answers I received. At this point I did change all my 100% sure ressies but am not going to sweat out the other four! I will handle it as the time comes.
I hope this helps you and makes some sense! I know I made it sound awful confusing but I just could not figure out how to simply explain everything. If you have any questions you would like me to answer, just give a holler!
And if you do decide to call back, please let me know what kind of answers you get. Perhaps someone here on the boards will be able to help us even more!