Yeah I think we have this issue all over the attacking positions really.
I am one of the people who thinks Dele should be playing every minute possible, he can be a major threat and has a touch of class about him, however where does he fit in and who misses out.
Off the top of my head Dele, Richarlison, Gordon and Gray need to play, that should be enough to be a threat but by playing them four you lose something in the midfield (which is awful as it is). We also have DCL of course who should be playing if able to do so and even Townsend who can score a goal out of nothing. We actually have attacking options but our team is so poor elsewhere that we cant get them all into the team.