I think you are quite right but still hasn´t been linked to any strikers. Tosun, Niasse, DCL - thats just not good enough for a top 7 place.
Sure it is. While goal difference is a better marker of expected performance than goals scored, GS is still pretty good. It takes about 60 goals on average to get 7th, in recent PL history.
The average PL team received 1 own goal and converted 4 PKs. Let's separate those out.
Figure your defenders are good for 5 goals combined from open play and free kicks/corners. This could be Baines directly, Coleman cutting in off the right, a CB from a corner, or whatever else you fancy. Last year was a bit of a down year in that regard due to a combination of injuries and setup, but I'd expect a bounce back. Especially with a Mina or another similar threat from set pieces.
Say 5 goals from Sigurdsson, and another 5 from your other midfielders (Gana, Davies, Schneiderlin, N.E. Other). Up to 20 goals, still need 40.
Tosun averaged 1 in 3 last year for Everton, after hitting about 0.75 goals/90 minutes at Besiktas. We'll give him 12.
Richarlison scored 5 for Watford, but his performance was indicative of between 9-12. With an offseason plus more talented folks around him, we'll give him 10.
Walcott's typically been about 1 in 3, but has a checkered injury history. Let's say 8, as he plays about 24 games per season on average.
Niasse won't have nearly the impact, I think, this term. Calvert-Lewin is healthy, and I'd expect him as a frequent sub to run at tired defenders. 7 goals between them, maybe?
Bernard is a wild card. 3 goals.
That's your 60 goals, without a big stretch. Sure, we'll absolutely have to tighten up at the back from what we've seen in preseason so far, but there's certainly goals in the team.