Sometimes, a coach has such a strong belief in a player that he will fight hell and high water to keep him. The coach would even lose his job for the player.
The coach's faith may be in the right place, but the player isn't able to just live up to the expectations placed upon him by the world. Sometimes, everything is just against the player and the coach, and they both end up suffering.
Either way, here are four players who, if coaches place his faith in them, will burn everyone involved.
Since being drafted in 2008, Chad Henne has proven to be a liability at quarterback. He is by no means a bad quarterback, but he certainly isn't a good quarterback either.
So far, his career quarterback rating is a subpar 75.7, and he is underwater on his touchdown-interception ratio. He is a mediocre quarterback by any measure you use, and he has been the Dolphins quarterback for four years. Coach Tony Sparano went to bat for Henne this offseason: the Dolphins are now 0-7, and Henne's on injured reserve.
While the Dolphins woes aren't all on Henne, he didn't help matters for the club.
Unlike other coaches from this list, Sparano's job is likely already gone. It's a matter of when.
I was a proponent of the Bengals trading Carson Palmer to a quarterback-needy team. Apparently, so was Mike Brown, who was waiting for the right price.
Brown traded Palmer to the Oakland Raiders for their 2012 first-round pick and a 2013 second-round pick that could transform into a first-round pick.
Palmer hasn't been the same quarterback since his injury, but he could still be a decent or even good quarterback with a ton of talent around him on offense. Instead, the Raiders have staked the franchise on Palmer coming back strong after a year of not playing football.
If Palmer doesn't perform to expectations, Hue Jackson could find himself in the unemployment line this year or next.
Mark Sanchez is a player who gets a lot of media attention thanks to being a New York quarterback. Sure, he's been the quarterback of a team that has been to the AFC championship game two years in a row. However, both times have been in spite of the USC alum.
It can't be a coincidence that the Jets have a great defense, great running game, and poor passing game both years they have great success. That's because they've done something similar to what the San Francisco 49ers are doing right now: minimizing their average quarterback's activity in the offense.
By having Rex Ryan do wonders with their defense, and with LaDainian Tomlinson and Shonn Greene (and previously Thomas Jones and Leon Washington) running behind their excellent O-line, the Jets have been able to support Sanchez.
It also can't be a coincidence that the Jets early season struggles came when they struggled to run the ball and had to pass the ball a lot. The subpar passing game put extra pressure on their defense.
Ryan's situation is a bit cloudier than usual. Ryan won't lose his job this season if he fails in the playoffs again after leading the Jets to more success in his first two years than they've had for most of their franchise history. However, he might be forced into letting Sanchez go if Sanchez costs them their season.
The Denver Broncos drafted Tim Tebow with the 25th pick in the first round of the 2010 draft, which was about two rounds too high.
Tebow was always thought of as a project player. If he was able to gain some pocket awareness, fix his throwing motion problems and dedicate a lot of time to the game, he had a high ceiling.
After a decent rookie campaign that featured a come-from-behind win against the Houston Texans, Tebow has followed that up with a (so far) poor sophomore campaign. The problem with Tebow is that he's shown no progression after a year in the NFL.
He still has talent, he can still lead a team, and he can still win a game. However, he has shown absolutely no improvements and still makes rookie mistakes.
John Fox is putting Tebow out there to help fix his problems and see how well he can do in a season in which the Broncos aren't going to the playoffs.
In a season in which nothing is on the line but jobs, Tebow is showing that he can't hold up. If Fox puts his faith in Tebow after this season, the results will be devastating for him.