wrong title.. "while Kenya had 18 medals won by suspicious athletes" is different from "18 kenyan medalists". What can be determined from the original statement is
1) the number of medals (gold, silver, bronze) are 18
2) there are multiple medalists... they could be 2 or 18
the assumption that there are 18 individuals is inaccurate.
All Mushrooms are edible! Some Mushroom are only edible ONCE!