A group of archaeologists recently discovered a skull fossil in a cave. Initially, they believed the skull belonged to a young saber-toothed cat due to its distinctive canine teeth. However, the skull structure did not provide enough space for the larger canines of an adult saber-toothed cat. Based on this, the archaeologists concluded that the skull fossil indicates a different species closely related to the saber-toothed cat.

Which of the following, if true, would best provide evidence showing that the conclusion above is possibly flawed?