Alexis Sanchez's form for Arsenal this season has been outstanding, but is there a case to argue that the addition of Danny Welbeck has been even more important?
The England international netted twice for his country at the weekend, underlining his talents and continuing to show Manchester United why they may have been rash in letting him go.
The striker's signing on transfer deadline day was absolutely crucial, and saved Arsene Wenger from fan outrage.
The timing of the addition was the key, because the Gunners had been lax in deciding whether to sign a striker in the summer, happy with what they had already, and only an injury to Olivier Giroud in late August forced their hand.
Had it happened any later than they would have been caught out, and just considering their options without Welbeck, is a reminder of his importance.
Against Leicester City, Arsene Wenger played Yaya Sanogo, who had seven shots on goal and only two on target.
Welbeck was able to come in instantly and looked the epitome of confidence, as if he knew he belonged, in contrast to Sanogo who seemed always let down by a lack of self-belief.
The 23-year-old is not just a quick fix, he is a long-term option for Arsenal, and has the potential to become one of the Premier League's top strikers, already being one of the best Englishmen.
Perhaps the best element of signing Welbeck, is the partnership he has struck up with Sanchez, and it is this which is helping Arsenal see the very best of the Chilean, who says he 'loves' playing with the £16 million man.
Sanchez is the immediate answer to the question of 'who has been Arsenal's best signing', due to his goal output, but this has been largely enabled by Welbeck.
When you consider how much further the Gunners could be down the table had they been left to pursue playing Yaya Sanogo up front for the past two months, Welbeck's addition looks even more essential.