I like your comparison between Collard and Carruthers. Time will tell but Carruthers heavy feet are not fit for the game as it's played in these days. Especially in the Show.
Collard is a more well rounded player with a lot of intangibles. His offense likely isn't anywhere near the other guys picked in the top range of the draft. He could be a less offensively gifted Nicolas Roy type of player.
He was picked high, but he was a local pick, and a safe pick with a lot of attributes you want to bring on your team.
I don't think Carruthers' game is anywhere near as complete. If anything, Carruthers is a pure goal scorer whose goal scoring hasn't translated yet.