I didn't say they were top 15, just that once you are outside of the top 15 you aren't guaranteed a spot in a 29(+double starters) athlete field. It's also unfair to use the 102, especially since he got 118 here, more than enough to qualify in an international competition. Of course comparing two different events is bad for shotgun events as weather plays a big factor.
Pan America may be weaker than Asia and Europe in shooting, but we aren't so weak that our best shooters wouldn't qualify to the Olympics without continental quotas, especially since none of the World Cup events have occurred so outside of the 4 USA quotas won at the World Championships we are more or less at full strength. Now quotas won at the Pan American Games may be a different story, but the Olympics does want universality.