Since last summer no Chelsea player has scored more than 15 goals for the club. No current Chelsea player has scored more than 13 in that time either. The lack of goals on a consistent basis by the team and more specifically attackers has been an issue that won't go away. It's been five years and other than Tammy Abraham, nobody has even threatened to hit 20 goals in a single league season.
That's despite over £300million being spent on the problem. The club transfer record has been broken twice on attackers in the timeframe and Chelsea have paid over the £32million it cost them to sign Diego Costa in 2014 on seven occasions since letting the Spanish forward leave in 2017.
All of this, and other than Abraham the most consistent scorer in attack - other than Mason Mount who is primarily a midfielder anyway - is Olivier Giroud.