Man, what a relief! I took SOOOO long on this one... not on figuring out the last square, but (as usual) figuring out the middle 2, especially the ARZ one. SOOO many players qualify for all but one category, either because they didn't get 40 points (Pyatt, Warriner, Berehowsky, Brad Richardson, Trevor Letowski, etc...) or didn't play in the OHL (Brent Ashton, Loui Eriksson, Aucoin, Dave Babych, and of course, Ballard, Vrbata, Greg Adams, and Grabner, who would all have worked for the top square if they had been OHLers!
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Finally, FINALLY, Mathieu Schneider came into my mind, and lucky me, an OHL guy despite being American!