By now everyone knows about the big news in the NFL. The Philadelphia Eagles have parted ways with head coach Chip Kelly, firing him after a disastrous season. Bad personnel decisions, poor time management and altercations with players eventually led to owner Jeffrey Lurie pulling the plug on this experiment with a game still remaining in the regular season.

Here are the top 10 biggest mistakes Kelly made with the Eagles.

10. Oregon Obsession

A lot of coaches make this mistake. They come into the NFL from a high-ranking college university, and they want to run their system with their former players. Kelly had nine former Oregon Duck players on the Eagles roster to start this Eagles season. Obviously that's not a coincidence. Kelly wanted his guys. He went all in for his former quarterback, Marcus Mariota, but came up short in the draft. Would Kelly have brought in Kiko Alonso if he played at another school? Probably not.

9. Releasing Evan Mathis

People didn't make a huge deal when this went down, but the effects were felt throughout the season. After Jason Peters, Evan Mathis was probably the second best offensive lineman on the Eagles. The Eagles decided not to select an offensive lineman in the draft, so cutting Mathis hurt big time. Now, whoever is playing quarterback isn't going to have much time to throw the football. Mathis had made the Pro Bowl the previous two seasons in 2013 and 2014.

8. Poor Drafting

This one ties in with No. 9. Kelly surprised many by not drafting an offensive lineman this year. Lane Johnson, who was drafted No. 4 overall in 2013, hasn't worked out great for the Eagles. He even got suspended for PED use last season. Wide receiver Nelson Agholor has just one touchdown and 260 yards this year. Agholor was picked in the first round of the draft this year. With drafting a complete disaster, Kelly turned to free agency and trades, and that would turn out to be even worse.

7. Letting Maclin Walk

Wide receivers are pretty expendable in this league, if you can replace them. Last year the Kansas City Chiefs didn't have a single wide receiver catch a touchdown pass. This year the Chiefs (who have won 9 games in a row) have got seven touchdowns from newly acquired wide out Jeremy Maclin in his very first year with the team. The Eagles receivers have been terrible this year. The second leading wide receiver for the Eagles this season is Riley Cooper, who has 327 yards and just two touchdowns. Bringing in Miles Austin was pretty much a slap in the face to Eagles fans everywhere.

6. Never Accepting Blame

Every coach goes through a rough patch. It's how you handle it afterwards that really gets the attention. Kelly lost the Eagles locker room, and that can't be denied. DeMarco Murray complained about lack of carries, LeSean McCoy called him out, and Peters eventually walked out on him, literally. Every time the going got tough, Kelly simply blamed the players. Last week Kelly said, "I am not the general manager," after officially being eliminated from the playoffs. Just another way of trying to get out of the blame of so many roster mistakes.

5. DeMarco Murray

After trading away LeSean McCoy (don't worry, we'll get there), Kelly had to find a starting running back. It looked almost certain that free agent back Frank Gore was going to be the guy, but he had a change of mind at the last second. With Gore heading to Indianapolis and McCoy now with the Buffalo Bills, Kelly panicked. He signed Murray to a huge contract with big cap hit numbers. Murray isn't getting any younger, and he has taken his fair share of hits over the years.

4. McCoy for Alonso

This was a disaster from the very beginning. See No. 10 on my list. Kelly likes Alonso because he's a good linebacker who went to Oregon, but giving up LeSean McCoy? With McCoy, the Buffalo Bills have the No. 1 rushing attack in the NFL this season. The Eagles' rushing attack is 15th overall. Essentially, Kelly traded away one of the best running backs in the league for a guy who didn't even play a single game last year. For the record, Alonso has had many off the field incidents involving drinking and driving, burglary and other confrontations with the law. What could possibly go wrong?

3. Ousting DeSean Jackson

This was probably the most illogical choice of all. Why on Earth would you release the best deep threat in the NFL, DeSean Jackson? Jackson had over 1,100 receiving yards last season, and now he has helped guide the Washington Redskins to an NFC East title. It might have made sense if the Eagles traded Jackson away for a few draft picks or a valuable player, but they got zero back for him. Nothing. On top of that, Jackson went to a division rival, who swept the Eagles this year. Why Kelly released a 27-year-old Jackson, who was coming off a 1,332 yard season, is a huge mystery in the City of Brotherly love.

2. Sam Bradford

Kelly must have been the only person in the NFL who believed in Sam Bradford. Bradford, who has torn his ACL the last two consecutive years, has failed to live up to a No. 1 overall pick status. Nick Foles has looked awful with the Rams, but the reality is Foles did look good with the Eagles. On top of losing their quarterback, the Eagles also gave up a 2016 second round draft pick for Bradford, who has never posted a winning record in his entire career. Bradford may not even get re-signed after this season, meaning the Eagles lost Foles, Bradford and a second rounder for nothing.

1. College Style Offense

In the end, this is what really did Kelly in. On top making so many mistakes with the roster, he decided to run a gimmicky college-style offense. We've seen this so many times in the past with college coaches who think they can bring their college spread option offense to the pros, and it fails. Every time. Kelly is no different. Instead of running Murray up the middle, he drew up plays for him around the outside. Bradford can't run a spread option offense because he's just not mobile enough. That high paced offense hurt the Eagles offense more than it hurt opposing defenses. The Eagles offensive line has no time to get set or rest between plays, and it caused major time of possession problems all season long. More plays doesn't mean more points.

Follow Damon Salvadore on Twitter @DamonSalvadore1