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Not to discount the study, but my son has had three concussions on the soccer field, and he wasn't heading the ball on any of them. (If you must know: Falling Courver goal to the head, collision with his own keeper's shoulder, and ball accidentally kicked across the field off the back of his head while he got a drink of water on the sideline during practice.)
Did heading the ball at other times make him more susceptible to concussions? I don't know, but I think all three blows would have caused a head injury for almost anyone.
If a soccer player makes it all the way through high school without a concussion, he or she is either lucky ... or hasn't been properly diagnosed.

Blows to the back of the head are very dangerous.

Also, the point about Coerver goals and such...good point. How many kids have died from goals that have fallen on their heads because they were not properly anchored?