Pelle illustrates more than anyone, the lot of a striker. He struggled in the first few games and he gets stick. Then he's brilliant and now he gets stick again. Any foreign player in their first season in England has a dip - Tadic and Mane are other examples this season. Pelle is a good player but playing up front on your own in your first season in England, getting no help from referees and playing every single game is going to lead to dips in form.