I never train one of these habilities, so, I don't know if, when you train it, "always" work well, or is like in the scouts, some better, some... worst and really there are some corner specialist with nothing of special.
That's the side of what I call "visible" special abilities. When you see that a player is programmed to have this "specific" ability by default, with better or worst result.

The other side, are what I call as a side of the hidden skills and abilities of a player, and is that a player without special abiliti can be programmed by default to shoot well corners and obtain 70% of goals when he shoot a corner, for example.
In this case, "you" and only YOU can discover this abiliti and take advantadge of this, because there's no picture saying that the player is specialist in something.
(-.-)' so, like I said in the beggining, somebody have to come here and say if when you waste the 50 tokens works for sure or, if for example, works depending the conditions of the player, if he is usually effective, for example.