Doesn't playing safety require that you be able to do a somewhat important thing like tackle with consistency/not whiff? He's done absolutely nothing which would warrant a position change which would benefit the team. Put him at safety and he's just as much of a liability.
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I would agree that Cro isn't a tackling machine, but he is a ball hawk. Rhodes couldn't tackle, yet everyone loved him at one point.
Just to reiterate, I did say if the coaching staff felt he could play safety.