Pretty simple mate. Any keeper that's under the age of 27, or hasn't won pretty much everything in the game won't be able to hack it and any experience at a club without their own page on goal.com doesn't count. We need to get someone who's got loads of experience and medals from a top club as they'll be a guaranteed success. Apart from Bravo as he wasn't.
Ederson is still in the potential stage of his career and will at some stage make some high profile mistakes (whether it he still at Benfica or at City).