In terms of skill, Gus would be our second best ruckman, but there is a minimum standard that must be met in terms of commitment, or 'heart', for lack of a better word, and Gus did not meet that standard after being given multiple chances to lift. Lost the respect of his teammates and wouldnt work hard enough to restore it. Had to go. If he turns it around at Adelaide, good luck to him, but he'd shown little respect for the Richmond jumper too many times.
The reverse of this is that blokes that always go 100% but are poo are still on the list. I think we all know who they are