Hm, form the very little that I've seen of him he didn't seem that intelligent, at least he didn't stand out in that department. Very much the case of technique over brain (although his technique was immaculate).
Cruyff's comment on him sound very much a backhanded compliment once you see him do this trick like 15 times in one game (usually successful though, surprisingly enough):
"Coen mastered one movement better than anyone: threatening to pass his opponent through the center, and then speeding past him on the other side. He was an exceptionally talented football player. A typical product of the Dutch school."
Obviously with those past greats you have to get lucky with what specific games you get to watch.