The true summit of Dinosaur Mtn is not the flat balancing summit-block rock that you have shown on this page. The true summit is a sharp point of rock that rises about 100-200 feet to the west.
Here is a photo of the true summit point:
And here is a view of the flat summit-block summit from the true summit. As you can see in this photo, the flat summit-block summit is 10's of feet lower than the true summit: