If you are a person who can keep them apart reliably without a chance of mistakes happening - and not even happening because a visitor who didn't know better let the dogs together when they shouldn't you can keep them you don't need to fix on of them. You might find that you need to board him anyway when she is in heat so he doesn't drive you crazy. Most humans make mistakes sooner or later, so the only really reliable prevention of unplanned breeding is fixing one of them.
Prevention is only as reliable as you and everybody else in contact with the dogs are. It seems to be way too early to determine that one pup will be suitable as a stud? Don't you first want him to get health tested and see what temperament and working ability he has?
He might be good, but right now you can just try to pick the best potential candidate and hope he develops as you expect.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.