When you use DDP and OOP you will get 2 separte checks. We did this for all meals in September. The DDP check will have the tip included, but the OOP check will not (unless there are 8 in your party). So you need to tip accordingly for that bill separately. While in WDW in September, we paid for our grandson's meals OOP as he was not on the plan. His parents were also not on the plan, but we covered several of their adult meals while there with our TS credits.