Yes, we didn't hear the exact words of the enchant in either story BUT would fathom have thought about how big darkstalker would get given no dragon had ever gotten to even a third of darkstalkers age?
Something has been bothering me. Over 2000 years Darkstalker grew to the size of a giant, and the fairly snug-looking moonstone bracelet only broke due to an earthquake? Not due to him growing and snapping it?