Top Five NFL Coaches Most Likely To Be Fired

There are plenty of coaches that are safe, but there are also a few in danger of losing their job. Which five find themselves on the hot seat in 2015?

Second overall pick Marcus Mariota will find himself struggling to succeed with mediocre talent around him in Tennessee.
Players are drafted by teams that believe they fit what they want, but sometimes the scenario is not ideal. Which rookies are in the worst situations?
How do we define epic fail? Jamarcus Russell epic fail. Ryan Leaf epic fail. Tim Tebow I dunno he won a playoff game?