Last 4 years (in order of productivity):
KANE:
137 goals and assists in 141 games
Involved in a goal every 1.02 games
SON:
104 goals and assists in 134 games
Involved in a goal every 1.30 games
LAMELA:
39 goals and assists in 58 games
Involved in a goal every 1.50 games
DELE:
96 goals and assists in 150 games
Involved in a goal every 1.55 games
ERIKSEN:
95 goals and assists in 153 games
Involved in a goal every 1.60 games
LUCAS: (2 and a half seasons)
32 goals and assists in 69 games
Involved in a goal every 2.15 games
I mean - I think it's obvious why we keep Lamela around. Yes, it's a shame he plays over half less games than the others but his productivity in comparison is relatively impressive.
Kane however is just a monster.