Holmes "et al." (2020) argued further that the proposed diagnostic characters of "Styracosaurus ovatus"/"Rubeosaurus" fall within the range of asymmetry and individual variation found in "Styracosaurus albertensis". The authors considered "R. ovatus" to be a junior synonym of "Styracosaurus albertensis". Another 2020 study describing a juvenile specimen of "Styracosaurus" further cast doubt on the usefulness of frill spike arrangement for classification. In that study, authors Caleb Brown, Robert Holmes, and Phillip Currie, concluded that the features used to differentiate "S. ovatus" were likely within the range of variation for the species "S. albertensis". They pointed out that several specimens that are otherwise consistent with "S. albertensis" have been found with inward angled midline frill spikes, though not the same degree as "S. ovatus". Given its slightly higher stratigraphic position and more angled spikes, they suggested that it may just be an "extreme morph" of "S. albertensis".