I think Amorim should give Sesko more playing time. The Portuguese manager could be criticized for not giving him enough chances. He's a quality player and could use a few tries. There's a cup match against Grimsby today, and I think Sesko will start. And that's what he needs to do, because he needs to be given these opportunities to shine.
I don't see any reason or why Ruben Amorim will start Mason Mount over Benjamin Sesko, I Can't rate Mason Mount performance 10/10 in their last two Premier League matches, he performed poorly both against Arsenal and Fulham so what do Ruben Amorim see in him that he is starting him over Benjamin Sesko, Benjamin Sesko is s complete No.9 which am very sure will score goals for the team through the help of his team mate and the new signings which make him a complete striker as a player, if Benjamin Sesko should be given more playin time he will adapt to the team fast just like Victor Gyokeres is doing, I hope Ruben Amorim will start him in their upcoming match against newly promoted team Burnley.