The NFL is a tough business.
You get hit or you hit until you are concussed. You break bones and are expected back as soon as they heal, and your contract isn't worth the paper it's printed on.
And to top it off, being named the starter doesn't mean anything past the week you just played.
Brandon Jacobs thought his spot was solid as the New York Giants starting running back. But that doesn't seem to be the case anymore.
Here's a list of other players whose starting days might be numbered.
The rule is you can't lose your job by injury. So what is it going to be then?
How many interceptions or badly thrown passes will it take?
Or better yet, how many losses before Andy Reid announces that he is going with Vick for the time being?
What's the over/under on consecutive incompletions before Philly fans scream for Kolb's head? Four?
I say two.
Matt Leinart is gone, so maybe Anderson feels whatever numbers he puts up, he's safe. But is he?
How many 17 for 31, 2 interception 42.5 qb rating days can he have before Max Hall gets a shot? And if not, how many 41-7 beat downs can Arizona take before Whisenhunt's job is on the line?
Shonn Greene is the runner of the future for the New York Jets, but that doesn't necessarily mean he should be the guy for the present.
As the starter he has run the ball 20 times for 70 yards. And has two catches for 17 yards.
Ladainian Tomlinson has run it 22 times for 138 yards. And has six catches for 42 yards.
That is double the production. LT is hungry and amped up.
Let the guy start.
Mason is that guy who never goes away. Year after year, you hear the Ravens are going to upgrade their receiving corps, but Mason ends up leading them in catches anyway.
But this year his time looks like it is going to be up really soon. If not by Donte Stallworth when he gets back from injury then certainly by T.J. Houshmandzadeh who is four inches taller and four years younger.
Mason's days are numbered, but they seem to always be.
Jarrett was another of the All-American receivers at USC to not do much in the pros. The Panthers have given him every opportunity and he hasn't. Though listed as the starter across form Steve Smith, it was actually David Gettis who got the start.
And after catching two passes for 40 yards in week one, Jarrett didn't scratch this week. How long before he gains fifty pounds, disappears and then reappears in a Seahawks uniform?
Maybe Julius Jones should take a lesson from his older brother. Run hard. Thomas Jones went from a 1400 yard season with the Jets to being a back up and Kansas City. But that didn't last long.
Meanwhile Seattle's Jones has been penciled in as the starter and carried the ball 12 for 30 yards. Justin Forsett, the back up, has three more carries for 57 more yards.
It's pretty clear that the writing is on the wall for Mr. Jones out in Washington.
Sometimes it's tough to figure out what a coach is thinking. Clearly Charles has been the more prolific runner for the chiefs. Just on pure yards per carry average, the two backs aren't close.
Charles has 22 carries for 141 yards and a 6.4 yards average. Thomas Jones has 33 carries for 122 yards and a 3.7 yard average.
They both are pretty much the same height but Jones carries close to 15 pounds more bulk on his frame than Charles.
Maybe Head coach Todd Haley is a bulk kind of guy. Regardless, after a great second half of '09 season, Charles is back to being a back up for now.
Jacobs was so frustrated during the Colts game that he tosses his helmet into the stands. He says it was an accident but word is that he might ask the Giants to trade him.
My how times change fast.
Williams is doing everything he can to hold his position. Williams caught four passes for 53 yards but was targeted seven times in the game. He also fumbled once.
Meanwhile Dez Bryant caught two passes for 52 yards and returned a punt 62 yards for a touchdown. Bryant is a star in the making.
All Williams can do is hold on for as long as his hands will let him.
Bills head coach Chan Gailey announced Monday that Ryan Fitzpatrick will start the team's Week 3 game at New England.
Former starter Trent Edwards struggled through two games throwing one touchdown, two interceptions and only 251 passing yards.
Gailey also hinted that this wasn't going to be a one week thing, either.
You have to wonder if the call came directly from Al Davis himself. Does he have the head coach's cell number that he can call while watching the game from up above in his owner's suite.
Jason Campbell said he was shocked when he was pulled after tossing an interception at the end of the first half of the Raiders and Rams battle. Especially since they were down only 7-3.
Bruce Gradkowski took over after halftime and led the Raiders to a come-back 16-14 win over St. Louis.
I hope Campbell is only renting.