I agree but pears will still be contracted to the club and as a manager / coach he wouldn't show his instant distrust to one of his players.
So what would happen if he signs today, and he drops pears to play de lange on Friday. De lange then drops a clanger and we lose the game due to it. His confidence is shot and that would continue until he regains it. Then you also have Pears who knows you think he's not good enough to be number 1 and he won't ever be a number 1 at this club.
Or on the other hand, De lange comes in, builds relationship with the players, gets a footing within the club and becomes number 1.
I'm also not saying that would 100% would happen but the chance is there and I'm 90% of most coaches wouldn't drop players straight into the firing line, especially goalkeepers
Also, I do believe we need to get Pears out ASAP with a better replacement but I feel that a coach wouldn't do this with a player coming into the club a few days before a game with next to no training.