Here it is, Button's list on TSN, where he gets 4/5 for everything except compete level at 5/5 . . . and is rated 9th overall in the 2015 draft. I'm pretty sure that was his highest ranking.
"Brock is a multiple force offensive player. He can score in multiple ways and gets himself into prime scoring positions. Creates opportunities off the cycle and from below the goal line. Nice touch around net but can score from 30 feet. Sets his hands exceptionally well to score with an excellent release and makes it difficult for goalies to get a read on his shot. Determined, driven player. "