I've gotten the impression at times that Neuville felt threatened by Paddon's speed. And when Neuville feels insecure he tends to over-drive and make mistakes. So that may well be part of the issue.
To not even consider Paddon for an event like Finland where he has often been the fastest Hyundai driver and has a good track record, and instead gamble on someone totally new to the team and unfamiliar with the car... it suggests that someone high up in the team really doesn't want him there no matter how good he is.