If Mikel Arteta needed any further proof that the vibrancy of youth, rather than the lethargy of experienced players at Arsenal, is key to their chances of success this season, then performances from two players on Saturday provided a crucial warning.
Willian's dire start to life at the club was once again on display as the 32-year-old was ineffective and wasteful, not for the first time in his Gunners career, lacking any sort of energy or drive to deliver quality to Pierre-Emerick Aubameyang as Newcastle held firm in the FA Cup third round tie.