What does the derived morphology of Xenoceratops suggest about the evolutionary pace of Centrosaurines?

Morphological innovation occurred in an explosive or rapid phase of adaptation.

Given that Xenoceratops already displays highly derived traits, such as a complex frill ornamentation and a large nose horn, so early in the North American fossil record, it leads to the conclusion that the morphological innovation defining the Centrosaurines was not protracted or slow. Instead, the evidence implies that this specialization happened rapidly—an explosive or swift phase of adaptation occurred right at the very beginning of their documented history in this region. This suggests the defining centrosaurine blueprint was established almost immediately upon or soon after the lineage's establishment in northern latitudes.