I was really pulling for either Brolin or Idris Elba. Obviously Brolin has more important things to deal with, and I wish him well. No offense to Pratt, but I think the movie needs to be anchored by someone a bit more commanding. JP had the kid hacker. JP2 had the kid doing Gymkata. JP3 had the kid survivalist. I suspect JP4 will have the kids doing something contemporary and relatable. Perhaps distracting a pack of velociraptors by twerking, or using social media to save to day. In fact, I suspect the poster will be a T-Rex selfie doing the whole ducklips thing with the tag line "#YOLO... unless you're a dinosaur." .