We're missing Pervis badly - he runs with or overlaps Mitoma so well either creating space or giving an option defenders don't know who to cover........Other teams have wised up to Mitoma, so now he always has two or three players on him when he approaches the byline. Defenders don't seem to be falling for his twinkle toes moves as easily anymore, and if they do, there's backup.
Still manages to get there now and again but not as frequently.
The development of Adingra and/or return of March will help stretch defences so Mitoma has more space too.