I don't think Broja would have eight goals and two assists if he played for Brentford, like Toney has this season.
Maybe or maybe not, but he is also 5 years younger. Broja doesn't need to be involved in taking set pieces like Toney does. Broja is quite able to score 15 goals or more for Chelsea, if they build the team properly around him. It's a team game after all.
If Chelsea get rid of some dead weight, and build a properly functioning team, Broja will shine. James and Chilwell are great for him, and so is Mount. Too bad Havertz doesn't seem like a solution, but get someone who can score a lot from an attacking midfield / false nine spot, and it will be great. A player of Wirtz type.
To form a similiar pair like Drogba and Lampard.