Experiences vary greatly on this topic with no wrong answers only personal experiences.
My experience has been the good ones start and end being good.
Have never been a fan of the "waiting on the pup to turn on" either they are turned on or they are not.
I like the pups that naturally go crazy the very first time they lay eyes on a hog ......extremely high prey drive.
Few folks dont mind waiting for years for a dog to "turn on" but I dont have deep enough pockets to feed one nor the willingness to maintain a tool that isn't being utilized and so far hasn't made the effort to make itself worth feeding.
Same expectations and requirements. DONT BEG THEM TO DO THEIR JOBS just find another that will.

Good luck

Couldn't of said it any better myself! I feel the exact same way. I show my pups a pig at 3-4months and see how they do from there I do staged hunts and drags for practice. At 8mo old they better be running with the big dogs. I expect at a year old to be running and striking hogs alone or with an older dog. I understand different breeds and bloodlines mature later but that's not for me. I had a Parker and culled him at 7months most ppl told me that's to early to cull one of these "Parker dogs" that they mature late and really hit there stride at 2-3yrs old. To me that is way to long to be waiting on a dog when there are plenty out there running and baying at a year old. No disrespect to the Parker dogs just using them as an example.