Clarkson may not have won a premiership as a player, but he was senior coach of a VFL premiership side and was assistant coach at an AFL premiership side.
Ratten was an AFL premiership player, but also hasn't won anything yet as a coach, even Grant Thomas could coach a side full of #1 draft picks into the finals.
Campbell has never been involved in ultimate success. How can you coach a side to a premiership if you've never even seen one at any level. He took a year out of the game after retirement and has been at the Bulldogs (who have just been making up the numbers in the 8 ) as an assistant coach. The guy has only seen finals in 3 years of his entire career (2 years @ Richmond, 1 @ Bulldogs)
If we were go for a rookie coach then Hardwick fits all the criteria, dual AFL premiership player & premiership AFL assistant coach. He's also a backman if you compare him to the positions played by most recent premiership coaches he fits that criteria too.