Because back in 2015 when the last shark was Alan, main sharks had no abilities (Alan btw had the first ability, stunning prey with his tail, though it's not really usefull) and thus special sharks were a copycat of items which could give normal sharks some abilities, like how the laser stuns prey like the Electro Shark or Ice Shark, though to a lesser extent Alan can do it too. But when was the Wereshark added ? When Leo was last. Main sharls still didn't have many abilities............................ Leo had a tiny vortex and Moby Dick, well a stun thing too............................................ But the term special was still practically unchanged because their abilites were............ better.............. but who cares about small weak sharks, we want big powerful ones don;t we ? It's that they are outdated.

And besides they are still specifal since, well, they do have their own abilities, plus they don't save level up................... you can't equip items,.................. yeah they are strictly their own thing let's say.......................