Once considered the next big thing in NFL, Keith McCants was drafted by the Tampa Bay Buccaneers in 1990. Tragically, a knee injury put an end to McCants’s dreams of having an enduring career in football. His worsening injury led to a painkiller prescription, which became an addiction. This eventually landed the linebacker in prison and without a place to call home. The future looked bleak for McCants. That is, until a hand of friendship was extended from an unlikely 21-year-old college student named Robert Blackmon. “In 2010, I was home from college and was reading the newspaper and saw [McCants] was arrested for the 14th or 15th time for crack cocaine possession,” Blackmon told ABC last month. “[I]n his mug shot he looked so incredibly sad.” Compelled to help, Blackmon, now a Saint Petersburg, Florida, city councilman, reached out by phone. “He immediately called back and said, ‘I think this is a God-send,’” …