I think an enormous part of this is that we are a team who have played with 3 in midfield for this whole period (more or less) and we completely lack actual sitting midfielder, one who is positionally aware and can sit in front of the defence. For everyone who clamoured last summer to suggest that Gana would be this player for us, he isn't and he never has been. He's an aggressive ball winner and he's great at it, but he doesn't screen a defence like a true number 6 (take Joao Paulinha at Fulham as an example). In the system we play, the way the midfield has been constructed is an issue to me and, despite Dyche's best efforts (where it has improved tbf), the gaps between midfield and defence are still an ongoing problem and when that happens and it's exploited, the issue you're both highlighting is suddenly brought to the fore, you're left with a defence who have to react. I still see it as fundamentally our biggest defensive issue.