Richarlison claimed five goals and eight assists between Gameweeks 1-24 while Silva was in charge of the Hornets.
He was averaging 4.3 points per match (ppm) before his scores took a big dip following Silva's departure.
Richarlison played no further part in any of Watford's goals from Gameweek 25 onwards.
He got only 22 more points at an average of 1.6 ppm.
But the 21-year-old's goal threat remains high.
Richarlison fired 95 shots on goal in his debut season, the fourth-most in the Premier League.
Richarlison is also highly skilled at getting into dangerous positions.
He had 17 big chances last season, the fourth-most among midfielders.
A big chance is regarded as a situation where the player receiving a pass is expected to score.
It suggests that more goals are to come in 2018/19.
|Mins/shot in box||38.2||141.4||76.0||61.0|
Richarlison made an immediate impact at Watford and he could well do the same again at Everton.
Eight of the Toffees' opening nine matches score three or less in the Fixture Difficulty Ranking (FDR).
But of the three, it is Richarlison's goal threat and output under Silva that can make him Everton's go-to attacker from the start of 2018/19.