I assume that with SA you mean Shadow Strikers (Shadow Attackers). Guys i would really not judge this much unless you have actually played with some. For example, i NEVER use 2 strikers. Never. I always use one and an AMR and AML. I purposely try to aquire ones with the speciality Shadow Striker. Do you know what happens? Every year they both finish with more goals than my lone striker who almost always has the most assists. You get the picture? Ball to Striker, who passes it left or right to Shadow strikers, who then either score, or don't.
If you think of it Bayern did it with Robben and Ribbery, Barcelona (when they had Villa as ST not Messi), and a lot more teams use this method. A Center Forward that comes up, gets the ball and passes it left or right. Spain (National Team) does it.
So i would ask that all of you that play with one Striker, and AML, AMR, to give this speciality a chance. If i'm wrong about anything i say, feel free to tell me
Thanks for your time
Zarko