Guilherme and Gunslinger would enjoy conversing with the brothers Danny and Billy Taylor in the Winchester area, if you haven't already.
Billy's farm
twhheritagesociety.com
Danny's farm
twhheritagesociety.com
I spoke with Danny Taylor a few years back over the phone for a few hours

It should've been an all-dayer on his front porch sipping lemonade mixed in with that white stuff

The Taylor brothers are in their late 60's/early 70's and have been in Walking horses all their lives. Mr. Danny Taylor sure told some stories.
My 25 yr old goes straight back to Wilson's Allen on his bottom. Mr. Taylor told me that is where Duke (the horse in my avatar) got his tremendous heart and work ethic.
When my chiro came to work on a horse, she brought her NH trainer husband with her to help because I can't handle being outside in this heat for very long. I stayed in front of a barn fan and when they were done, like all good horsemen her hubby wanted to see all my horses.
He stared in amazement and asked "are these Walking Horses?" I replied they were, except for the little Arab. He asked if they were Foundation horses.
I replied they could all be considered close-Foundation-bred horses as the 17 yr old's (my youngest) parents were both in their mid-20's when he was foaled. He is only five generations from Old Glory on the top and I believe six from Nell Dement on the bottom.
He shook his head and said "I LIKE your Walking Horses, they have some meat to them. I could rope off any one of them. I have taken TWH's in for training and none of them are put together as well as all of yours".
But it isn't just the Walking Horses - it's every breed. Take any breed in today's world and compare them to 40 years ago - there is no comparison.
I much prefer my old Lippett Morgan/Egyptian Arab cross that I laid to rest at age 27 in the late 80's to the Morab crosses I see in today's world. I hate saying things like that because I love and appreciate all horses but human intervention has not always been kind under the guise of "preservation" or "improvement"