Claim: Among Undrafted Free Agents Jahad Thomas of Houston Texans is the heaviest while Phillip Walker of Indianapolis Colts is the tallest.
Evidence: He was signed by the Dallas Cowboys as an undrafted free agent after the 2017 NFL Draft. 
Thomas signed with the Dallas Cowboys as an undrafted free agent on May 12, 2017. 
On August 23, 2017, Thomas was signed by the New York Jets.