Pierre-Emerick Aubameyang is doing what he has done throughout his career: scoring goals. Three in five now for Chelsea and more important than the strikes themselves has maybe been the manor of the finishes.
Whereas the Blues have become accustomed to flexible front-lines over the past 18 months, especially after the Romelu Lukaku experiment didn't work, there was a feeling that it didn't matter who they had, goals wouldn't come.
It was a creativity issue, it was a formation issue, it was a Lukaku problem, blame Mason Mount and Kai Havertz, maybe it really is the No.9 shirt, Timo Werner has gone, was it all his fault after all?. Nobody could work out how to get Chelsea scoring any types of goal. A Jorginho penalty often saved them, but that's not sustainable.
