Safety Isaiah Johnson had several contract offers after going undrafted, but he ultimately decided to sign with the Detroit Lions.
When it comes time to sign undrafted free agents, teams have various pitches they can make to prospective players. A sizable signing bonus can come in handy, for example, as can a track record of undrafted free agents making your team. An open spot on the depth chart and a real chance to make the 53-man roster can also be big selling points.
In the case of Georgia Tech safety Isaiah Johnson, the Detroit Lions had several pitches worth utilizing.