My guess is as good as anybody else ' s when it comes to how things are going to go between Jackie and Marco . With the current emergency they find themselves in , I doubt Jackie and Marco will start dating , especially with Marco who will probably put his focus on helping Star . I mean , he still has to reach a conclusion with Jackie , but I ' d have to create two hypothetical scenarios based on the idea that Jackie and Marco might or might not start dating in order to speculate on what will happen . And about Starco happening , I think at one point Star will inadvertedly cause Marco to become attracted to her . Meanwhile Star herself will be building up the courage to tell him the truth about her crush on him . So they will keep being sweet to each other as usual , maybe a bit more shyly than usual , until both reach the conclusion that they want to be more than friends . I mean , there ' s no need for this to be like Pirates of The Caribbean with Star and Marco getting married during a ship battle in the middle of a giant whirlpool .