SA is such a thing... I don't know, if it's good or worthless...

I have some theories:

1.) SA have to suit to the player, that means: Try out, if he kicks good from corner, check him as FK,... If he is a good CK, CK would push him to a really good kicker:
--) example: a RL-friend bought an AML 2 season ago, he set him FK/CK and penalty. At his first 10 games, he scored no FK (~25), he made a good amount of assists vom CK (I think, 8 of 30), he didn't score much - especially he didn't score from wide away (like SS). He decided to give him CK: the rest of the season he played 10 more games, made 14 assists.
last season: 44 games played, 41 assists.
this season: 18 games played, 15 assists.

2.) Key attributes matters:
I said a few times, I had PM, who kicked the corners. And they also did it... my "current" corner-kick-PM has high passing, crossing and creativity skills. He made average 25 assists/season.

BUT... on the other hand, Sperl made average also 25 assists/season, without that high % at passing, crossing and creativity.
And Costa... who has the highest % in my team... kicks good corner (SA=FK), but not that good like my the CK of my friend

3.) it's just a hidden "script", who performs good...
example: I sold Weigl this season. At his new club, he kicks all FK. I saw ~5 games and nearly every FK leads to a goal.
At this club, there's also a ST with FK. 2 times, Weigl was subed, so I saw the ST on FK... but he scored not a single one.