Amidst the clamour for the one-twos performed by Eden Hazard and Olivier Giroud at Stamford Bridge, you would have been forgiven for forgetting that Chelsea's attacking line-up comes in threes these days.
While the Frenchman justified his place in the starting line up ahead of Alvaro Morata with some cute hold-up play and the Belgian continued his extraordinary start to the season with three more goals, Pedro was trying to pick up from where he had left off before the international break, too.
That he didn't was not for the lack of effort, or guile.
The Spaniard signed a one-year extension in the summer and it looks to have been a wise move on both his part and the club's - he has never looked more at home at Stamford Bridge.
He was quick to draw comparisons between his new boss Maurizo Sarri and his former Barcelona coach Pep Guardiola during pre-season, and it's clear to see why.
The 31-year-old has started this season in eye-catching form, scoring three times in his first four appearances. To give you an idea of the general malaise he had been in before the Italian's arrival, his last trio of strikes had come over a period of 26 games.
Pedro enjoyed his best years at Barcelona under Pep Guardiola, lifting two Champions League titles and regularly making key contributions, such as his scoring role in the 2011 final against Manchester United at Wembley.
So it should be no surprise that a similar style brought to the Bridge this season has seen him rediscover some of that flair that made him part of the most feared frontline in Europe.
In Sarri's version, he has been given a free role, able to switch flanks as he pleases, attempting to exploit the space left by Hazard, or created by the centre forward.
That his confidence has come back following a season of uncertainty under Antonio Conte was clear by the shots he was willing to take on.
A curled effort after 24 minutes had Neil Etheridge sprawling, as it sailed just wide of the post, while an audacious chip from the edge of the area also had the Cardiff City keeper sweating.
There were some efforts that weren't as clever, one noticeably wayward effort from a Cesar Azpilicueta cutback found the top tier.
But to downplay his role in this victory would be doing his workrate a disservice, not least if you look at the second goal.
The former Barca man showed strength to win a free kick in the City half after a foul from Bobby Reid and reacted instantly, setting off into the area. That's where he was found by Marcos Alonso and his low cross was touched into the path of Hazard by Giroud, the No 10 making no mistake.
Pedro went in search of his own contribution in the second half but grew frustrated, spinning on his heels in the centre circle after miscontrolling, before making room for himself on the edge of the box with a neat sidestep, only to fire just wide.
His smile was rueful as his number was held aloft for him to be replaced by Willian, every coach on the bench met with a handshake and a grimace. Those teeth may have been gritted that little harder after seeing the Brazilian net a wonderful fourth. It was not to be his day.
Instead, this was a day that belonged to Giroud and Hazard. But there will be plenty of time yet for Pedro to prove that good things come in threes.