I don't think there's some special hidden tactic that Super Imps has discovered. Stats wise, his defence is pretty formidable. His defenders probably share the same stats as my midfielders do, give or take. It's no surprise teams struggle to score, let alone beat him. What I find is impressive is that the fact he can maintain such a high-level performance every season despite players declining, he definitely has a golden method in terms of having a high stat player lined up to place a declining one - in terms of real-life youth systems, Super Imps are like Barcelona and their star-studded academy!