13. John Riggins
In 1980, Riggins rocked the Redskins when he dramatically retired. He attempted to restructure his lucrative contract with the franchise but Washington rejected this. Then the running back quit the sport because he fell out of love with it. He sat out for an entire season before Joe Gibbs knocked on his door. The new head coach attempted to lure him back to football because he wanted his trade value.
Riggins agreed to play but only if the Redskins inserted a no-trade clause. However, this was a blessing in disguise for Gibbs because he helped the franchise to an unprecedented period of success. Riggins helped the franchise to three Super Bowls during his second tenure with the team. Meanwhile, his mind was in a better place and he was making more money than before (via Washington Post).