Actually, you are wrong...The truth does not lie in the fossils, as you cannot infer they had lips from them. The truth lies in the dinosaur's family tree.
Dinosaurs' closest cousin is the crocodilians...They have no lips what-so-ever.
The dinosaurs' ancestor, birds, have beaks, not lips. Birds evolved from smaller theropods or other Saurischians...So it is MORE LIKELY and plausible that they did not have lips.
Lizards branched of archosaurs before dinosaurs evolved.
They don't need lips to accomplish that task.
Dinosaurs' had a Jacobson's organ in the roof of the mouth...They would of more likely kept their mouth OPEN so air can pass over it.
I have just given several points...what's to be dissapointed about?
SG7, you have not been trying to tell me anything...Not to sound cocky, but I think I know more than you on this subject.