User blog comment:Lord Loss/Monster Hunter Theory... Blog/@comment-25192100-20140908182425/@comment-4009941-20140910152159

Sherureusu is a ancestor not a actual Rath yet. According to capcom it was the process of a Rex Species turning into Rath's. Not a actual Rath quite yet. On the other hand Canopus is fully developed as same with Seruregiosu into their own species. Sherureusu would be like all 28 Raths, all related species and possible related into one monster. If you see what I mean.