The Orthacanthus in Jurassic World: The Game has the matching spike and dorsal fin, so I imagine that was the base of the design and tried to model it so it would fit nicely with the Dunkelosteous animations.
A FANDOM User
It kinda does but on the Orthacanthus in JWTG, are the same features a real Orthocanthus had, though it is exaggerated in size, I mean they make it bigger than Dunkleosteus, I am all for that but once I look at real size estimations it just blows it out the window. They put that extra work into making it bigger when it really wasn't. COME ON LUIDIA