Yes, Lindenwood "found" Donald Thomas. They found him to play JV basketball. His coming out for track and the high jump had nothing to do with the track coaches recruiting or developing him. They really didn't develop him so much as give him a uniform, make sure he got to the meet on time, and tried to work on some semblance of a J. That was a good and knowledgable coaching staff too. The problem was "if it ain't broke don't fix it" during the season. There wasn't a lot of time for development. That was 2 staffs ago though. The new head guy is a distance guy from Britain. I don't know much about him, so I'd cross Lindenwood off the list for high jump development.
If I had to choose the best high jump school, I'd have to go with Rovelto at Kansas State. He's consistently produced great high jumpers over the years. That's not to say any of the others mentioned are bad. I just like his approach and resume the best.
If your athlete is a junior, make a list of the best few programs and head to their camps this summer. That'll give you and your athlete a better idea of who's the best fit for him.