John Stape: What's the point?

He came onto the cobbles, teaching English Lit to Sally and patronising Fiz. He whimpered by the whiteboard in the classroom every time Rosie came into class and if Kev Webster hadn't thrown him to the cobbles and knocked seven bells out of his insipid little face, I might have had to do it myself. And now he's coming back! Next week! What's the point of John Stape? Anyone know?

Of all the folk they could bring back to Coronation Street, why not this well loved character or even this one (my fave!)