There is no such thing as figuring it out. There is only Flick making players work as hard as last season or even harder, or adjusting if they can't. There's nothing to figure out.
Sevilla and Brugges don't have peak Xavi, Messi, and Iniesta to resist pressing and find ways to pass through it with sublime technical control. If you press them well, you beat them to bits. The only reason they had it easy vs us and scored a lot of goals is because we didn't do our part at a level that is anywhere near good enough.
This system is basically all press. Press ruthlessly upfront and in midfield, and you have a chance to win against anyone. Press anything less than that, and you can get stuffed by anyone. It was like that from day one, and it is like that today. The difference is our level has dropped.
This system is not some fancy high-complexity juego de posicion like under Pep. But it's good enough to win with it against the current lot of teams, if we do our job and tweak a few things on tactical level.