What would you call the diamond for the last year when it has clearly been costing us, he has stuck by it stubbornly while seeing with his own eyes the issues it has caused, when a bunch of fans who I assume have never worked in professional football saw the team against Bayern and predicted what was to come that tells it’s own story, yet Poch thought that was the correct team to pick.
I'd encourage you to watch all the Bayern goals again, and analyse with an open mind which were caused by the diamond (directly or indirectly). I've looked at them numerous times, and it's really only the first IMO that can be attributed to it (and even then it's not the main cause IMO).