I agree in that if you play the same 11 baring one or two, week in week out then two things are going to happen. Injuries, and a team that can't go 90 mins because they are absolutely knackered despite an international break. You can't change the formation too much because we are already playing players out of natural positions.
That said, I thought we were lazy in our passing, in out thought process and decision making all over the park. For me, today, I'd have tried to make it difficult for them all over the park. Challenge for everything, give them no space, no time. Literally a cup tie. Sadly, we did none of that and received a thumping which could have easily been 5 or 6. Thank goodness it wasn't.