I have a few hunches about dinosaurs;
1-) I'm thinking that the thick necks of large theropods supported far more muscle and meat than commonly imagined.
2-) I imagine that most dinosaurs, especially the "reptilian" ones, bore elaborate skin flaps and display structures on their heads. I have no evidence for this, but look at just about any living animal, and then see their skeletons. There's far more to soft tissue than most reconstructions admit.
3-) Dinosaurs, like real animals, sustained injuries throughout their lifetimes. (look at the hand!)
4-) Some dinosaurs may have had their upper leg "buried" inside their bodies. This is the case with most birds and mammals today.
All these "hunches" have been realized in this fun drawing.