Fosu has come on and done well IMHO. However, Brian does have alot of assists and that is a fact.
I'm not discounting his contribution, however IN MY OPINION and that's all it is an opinion, Brian is alot easier to defend agaist due to his lack of a right foot and if he's going to fufill his potential he needs to work on that a lot, because all defenders have to is show him down the line and they can be relatively confident he can't whip it in off his right foot.
Do remember that game when Brian took everyone by surprise and crossed the ball beautifully into Tariq (who isn't the tallest or most physical) who scored a header on the back post. We need more of that from him.
What about the game when we made a fast break and Canos was basically in his own postcode, instead of just using his right foot, Brian tried to cut in off his left foot and crashed into the defender tracking back, I can't be the only one who felt the frustration there.
My eyes tell me Fosu>Mbeumo on the right at this moment in time and if Brian wants to prove me wrong there are plenty of games left in season to show his quality.