
I must say Roberto Firmino is one of the most underrated players for Liverpool so far this season. He is an invaluable player and his contributions especially in away fixtures has helped Liverpool to pick up vital points on the road and also the Club World Cup.
Not taking anything away from the rest of the players, there are six many stand out performers as is expected in the squad of potential league champions.
Not trying to take anything from what you said but you understand firmino is the NO9 for Liverpool and as a striker you're supposed to turn up for the team as frequently as possible but that isn't the case for firmino, sure he turns up when the team is looking for a way to break the defence and also makes important passes (assist) but he doesn't have much goals in him as a striker.
The like of mane and salah which aren't striker has more goals (and probaby more assist too) than him. He needs to up his game as when you speak about too strikers in the league and Europe in general, hardly before the name firmino pops into my head.