The situation is a bit unusual, one could say.
Providing the under-performing starter with some competition (from a younger, "hungrier" player) is par for the course. But giving the younger player a huge contract (making him one of the best paid players in the world in his position) is...certainly not common practice.
And it becomes all the more unusual when factoring in that the under-performing starter himself is only thirty years old - which is nothing for a goal keeper.
Actually, Dave is only 29 - he should be entering his best years, really.
Let's say (and I'm sure we all hope this will happen) Dave does step up - what then? We have a second choice GK on big money who clearly won't be happy being second choice for...well, years.
Expensive way to give DDG a kick up the arse.