The Dallas Cowboys have been known throughout their history as having outstanding Offensive Linemen, and John Niland was the first one they acquired with a first round pick (5^th Overall in 1966).  

“Dandy” Don Meredith arrived from SMU to the Dallas Cowboys, and the original Cowboy would become Dallas’ star Quarterback in 1963. 

Ralph Neely played his entire career with the Dallas Cowboys, where the All-American from Oklahoma found a long-term home.

You don’t usually talk about personal services contracts, but that is how Don Perkins was signed by Dallas…providing they got an NFL team.  They did, and the NFL allowed it, as the Cowboys had to send a compensatory 9^th Round Pick to the Baltimore Colts who chosen him that year.