The shadow striker SA is typically for AMC/L/R, which enables them to perform like a striker in goal-scoring situations.

From own experience, my top AML/AMC/ST with Shadow Striker SA (rarely used as a ST unless some specific scenario pops up. Eg. an inactive opponent gets a DC sent off, so switch play to 3 STs to take the most advantage) scores loads of long-range shots and nearly never miss, when ML and DL would have some saved.

Need high shooting and finishing to make the most of the SA.