Honestly, to me, the biggest single attribute/culprit here was the absence of Thiago Silva. It was abundantly clear the Luiz had literally 0 control over that back line. As a captain, especially in the back, it's his duty to anchor the defense and call out assignments, adjustments, etc. It just wasn't there.
And, yes, the absence of one man can cause the catastrophe witnessed. When you're missing the anchor, captain, leader of your defense, it's basically JV soccer out there. It was some of the most abysmal defense in this Cup.
Credit to Germany, obviously, but there was no excuse for the absolute no-brainer mistakes that Brazil was making.
This was NOT the team that beat Colombia. Even though BRA had been shaky, a team with Thiago out there would have held far better ground.