I belive that 1on1 GK ability works only against 1on1 ST. Few advantage ability and for each of that is a counter-ability:
One-on-one stopper against One-on-one scorer
Arial defender against Corner specialist
Defensive wall against Free-kick specialist
Playmaker, Dribbler and Shadow striker are more likely skills-ability, and not real advantage like those 3 which can cause a direct-win(with goal from FK, corner...).
In my opinion...