*facepalm* - you're hopeless. A percentage of shots is so so so so so so so so so so much more important than faceoff %. Go look at the guys who are top in the league in Fenwick % year after year vs. faceoff percentage, which players would you rather have? Faceoffs lead to shots. Shots (and consequently goals) are what win games. You can't faceoff the puck into the net.
Alright listen, stats always depends of the situation you can't just compare the 2 and say that one is better. Also those guys on top of the league there are getting results. Zajac isnt. Ridiculous to say a guy is "killing it" when he has nothing to show for. Say wtv you want, when Zajac is shooting the puck it's to score, he's not achieving that so no, he not killing it in that department.