Barber for Cromartie makes sense.
Barber isn't done, he's slowed down, and a power back's life in the NFL is short. However, he did rush 214 times for 932 yards with 7TDs and an average of 4.4yards per carry. Not to shabby for an off year if you ask me. The main issue is the contract, and the fact that in a few years he will be done.
Cromartie has his issues, but honestly there are worst head-cases in the NFL, and in one point in time several of them played for the Cowboys at the same time. He has the skills to be a great FS, and while he hasn't given his best effort, he has shown people that he is a Probowl caliber player.
With that said, both teams could benefit from this trade. A Barber/Sproles combo would be sick, and a playmaking safety in the Cowboys secondary would be deadly (Jenkins and Cromartie alone could make QBs tremble and think twice for a questionable pass).
Having 7 kids irresponsibly is no laughing matter, but it's not like he killed someone...
Besides, he needs discipline, and there is leadership in the locker-room now (finally). Wade can fit him into the system, and honestly once motivated, Cromartie should excel in our defense.
Every trade has its risks, but right now, Barber's contract could pose a threat to signing other future FAs, etc...
I'm not a Cromartie homer, but he could be the safety we have been looking for. He's a bit raw, but afterall, it took Jenkins a year of serious improvement to get to where he is now. He's tall and rangy, if he could learn to watch film, he would make our defense unstoppable.