My opinion is it wont have any effect on the pups. We have been running our pups with a buddies plotts and his pups are open and ours are not. I think it has more to do with each individual dog. I don't buy into the open dogs making a silent dog be open and vice versa.
X3 or 4 or whatever it is.

Been hunting silent cur dogs with open hounds for a few years now, no change in either.