If this is TLDR, no problem.
The Soviet Union was the first country to use model physical characteristics to be able to project future growth, potential speed, and the sport most suited to match the athletes projected size, etc.
If a young athlete was 4"-5" taller than his age group, and his dad was 6'5" and the mom 6'0" that young kid, usually by age 9, would be developed into either a volleyball or basketball player. If the 9-year-old boy was very fast for his age, and his parents were 5'10" and 5'4", especially if either were heavily muscled, then he would be developed into a sprinter.
For 11 years I worked in Little Rock and then San Francisco with the former Soviet Union Olympic sprint coach. Prior to my association with him, he had identified Sergei Bubka as a 9-year-old. He was a great athlete, a very fast, but not an elite sprinter, so they developed him into a pole vaulter. Over the year, Bubka set the world record in the pole vault and re-broke it about 6-8 times. (A 1/8th" at a time because each time he set a new world record he got 100K). Coach T called him "a sprinter with a pole."
Rhule uses model physical characteristics along with track speed, especially legitimate 200-meter time, dovetail that with high-level development including a top-notch strength and conditioning program.
Since he fired Ellis, I would assume he will incorporate a different type of training table, but, that's just a guess. He may not be satisfied with the BMI, the percentage of fat compared to muscle in different position groups. and steps will be taken to bring those into closer contact with what he feels he needs to rebuild this program.
This is a program that needs a complete makeover, and it looks like that's what he will be attempting to do. I've said it 100 times, you can't eat an elephant in one bite. Bit by bit some of these areas will be up and running and then it's off to the next piece of the puzzle to be solved. When it comes together, we will see what we have.