Well that's the thing. Defence isnt something he's always struggled with
In fact his roosters and sharks teams were pretty much ALWAYS strong defensive teams, even in years they struggled. Defence is what he's made his bones on as a coach.
He pioneered this defensive system where he got numbers into tackles, peeled off slowly and dominated the ruck that way. It helped him win a comp with the roosters and maintain some good results after with the Roosters and Sharks (before it all feel apart)... but the game moved to this wrestle era under Bellemy, and the rules changed a bit to stop these 3rd and 4th men coming in as flops to slow the ruck and Stuart hasnt been able to adjust his style to the new age rules