I agree with Catalyst. You guys need to get some facts straight.
First of all it was a good trade. The Bears moved up drastically in the draft from a 60ish pick to the 37th overall pick. That is a pretty big jump. It's equivalent to having another 3rd round pick.
Second of all Jones is getting old for a RB, 31, and obviously his body isn't what it used to be. Sure he is still ripped, but playing RB really takes a toll.
Third, the Bears drafted Benson to be a #1 back 4th overall, which he should be. Sure he has some injury problems, but nothing drastic. He should be fine. Look how everyone thought Grossman was never going to play an entire season. Benson will be fine
Fourth, Bensons running style fits better with the offensive line that the Bears have. The Oline loves to run block, and they love to pound Dlines. Benson is a bruiser, although he needs to turn the nob back a little bit on that because he will be getting injured if he tries to bruise too many linebackers. Benson fits the Bears running game very well.
Fifth, Do you guys remember Jones sitting out this past summer? He wanted a new contract and didn't get one. Also TJ has been saying that he wants to be traded. He wanted to last season even though he didn't publicly say it(later stated by Jerry Angelo).
Sixth, You all should have known this was coming the day the Bears drafted Benson. They paid him way to much not to start him already. Also, the Bears have some big contract extensions they need to get with Berrian, Vasher and/or Tillman, Grossman(depends on 07-08 season) and Tommie Harris. The Bears are ready for Benson and giving a contract extension to TJ would just hurt the organization, leaving less cap to sign some of the core players.
Oh yeah, did I mention that Adrian Peterson is going to be a great backup RB? The 05-06 season he averaged 5.1 yds for something like 376 yds. Were going to be fine at RB.
The Bears aren't in developmental mode anymore. They are one of the top teams in the NFL. They are getting serious about a great running game. 3400 yds over 3 years is not that elite anymore. Sure TJ was the first RB since sweetness to run for 1300 in a season for the Bears, but across the NFL you see other RB's getting upwards of 1800 yds. LT,LJ,Alexander(last yr), those guys are elite. That's what the Bears want, and right now Benson gives them the best chance for production like that. TJ is most likely past his peak(being this yr and last yr), so it really made sense to trade him. Now I'm not saying that Benson is going to run for 1800+ yds next season, but he defnitly could hit the 14-1500 yd range in my opinion. That is if Turner finally realizes not to call hail marys on 1st and 2nd downs all the time

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And this all comes from a big fan of Thomas Jones. Seriously, I really like TJ, but it was time for him to leave the Bears, and Angelo had to get something out of him before he was worth nothing to another team.