15. Depends on your playstyle; I prefer the latter.
16. Totally safe if considering a long shot from the opponent half.
17. What do you mean?
18. They're useless, both.
19. No, it means no tackles
20. It depends on your formation. Narrow formations like 4-1-2-1-2 ND are good with short passing due to the close proximity players. 3 line formations (like 4-3n-3, 4-4-2 3-5-2) can do well with mixed. And with wide formations like 4-3w-3 or wide diamond or formations with AML/R and DL/R, down flanks does good.
21. False. My striker David had 34 goals and 11 assists in 38 games.
22. Yes, while the SA is active. So a 5* FK specialist player will perform as good as a 6* non SA FK player.