A fifth final lost in a row is the kind of trend that makes supporters demand big gestures. Sack the coach. Burn it down. Start again. It is an understandable instinct, but Leo Cullen and his coaching staff are contracted to June 2027. And Leinster rugby rarely goes in for public execution of its coaches. What there will be is a long list of questions sitting in the in-tray after the non-performance in Bilbao last Saturday. Just how honestly these are answered will decide what the next year looks like. The chief executive and the Professional Game Board should already have a…