it's basically gonna be like this. After we get to the grandline, we will meet Brook and Laboon where one of the crew will get sick or badly injured (i haven't decided who yet). Brook will tell us of a rumor he heard about a doctor on a nearby island close to the red line. we go there and Leo's arc takes place. after that, some shenanigans happen and we go get our cook. after the cook's arc, we start Natsu's arc (i'm pretty sure Crimson and Lady have a few ideas for this)