This may have come as a shock to him, but it should not be a surprise to anyone else paying attention. There was no way that the Atlanta Falcons were going to guarantee a fifth year for a defensive end that has spent more time sacking people on twitter than he has on an actual NFL field.
McKinley gave us arguably the greatest draft moment ever just four years when the Falcons drafted him with the 26th pick overall in 2017. The franchise was hoping to pair him and former defensive end, Vic Beasley, together and have an unstoppable tandem for years to come.