The 20th team in this 32-part series for Yahoo! SportsKermit the Frog said it's not easy being green.For the Chicago Bears, it has not been easy being in the same division with the Green Bay Packers. That was evident when Lovie Smith took over as head coach in 2004. He made beating thePackers a priority. He also made winning a priority. Among other accomplishments, he got the Bears to Super Bowl XLI and within a game of the Super Bowl in 2010 (a loss to the Packers in the conference championship game).Last season, the Bears finished 10-6, the same record as the Super Bowl XLVII champion Baltimore Ravens. But it was not good enough to edge out the 11-5 Packers or 10-6 Minnesota Vikings for a playoff berth. And since that 10-6 came after a 7-1 start, the season was deemed a failure and Smith was let go. Enter new head coach Marc Trestman. And onto 2013, and here we will take a look at five players who could be critical to the team's success this upcoming season. While in some cases the obvious will be stated, in other instances the focus will be on a newcomer to the team or a performer looking to rebound from a disappointing year. So here are five players to keep an eye on this season when it comes to the Chicago Bears: