I think it'll be lesson learned after tonight.The very, very good run of form was 442 not 433. Critchley should take notice of the old adage about not changing a winning team. Tiredness, injury, loss of form ok. But not change for changes sake, it appears he is trying to make his favoured formation work against all the evidence to the contrary.
He is afterall a young and inexperienced manager learning his trade.
Mistakes will be made and learnt from.
It really isn't the end of the world. It's one game.