This seems to stretch the meaning of "discovered." Hey look, I just discovered a dinosaur at the natural history museum! It's older than they thought it was!
Certainly it is a significant contribution, but I have to admit that my mental image when reading someone dicovered an ancient sword is of someone digging it out of the ground.
If you "discovered a dinosaur" that was completely mislabeled and of the oldest dinosaurs known to man "hiding in plain sight" - you deserve it.