Why should it needed to have been in tatters when someone like Davuies is there to be used and is a very good young player?
Instead of keeping the team and shape that won against WHU and replacing Gueye with Davies Koeman tore the whole thing up needlessly and tried to out-Chelsea Chelsea....and I think he went three at the back because he didn't want to leave Jagielka out again...which is a crazy decision.
He clearly went with a back three to try and match them man for man. In hindsight, a mistake, but if you look back on here there were several posters (myself included) who thought that might be a reasonable tact.
The gameplan fell apart with two goalkeeping errors.
After that the performance from players and manager alike wasn't up to scratch.