Summary: Marcell Dareus might wind up being the best defensive lineman in a draft crop littered with top talent. Coming out of Nick Saban's 3-4 defense, he is ready for the NFL although he only started four games in 2009 and was suspended for two in 2010 so he is light on experience. His family life has been hard and teams will have to be sure he is still motivated to work hard after getting paid. Assuming he clears that hurdle, teams can either use him as a 3-4 end or possibly a nose tackle.
No point in trading for Cousins, there's almost no chance he succeeds. 0 WRs and TEs to throw it to, so it would just be a waste of his prime years. If Shanahan reealllly wants him, wait until next year since he seems to have a rift with the Redskins. Besides, next year's quarterback class is much better if they fail to sign Cousins in FA.
I don't agree on a lot. They have so many cuts on the OL you didn't mention including Dunlap and Franklin which will save them 12+ million. Stuckey is not worth 3 million. They can make on very solid move or a couple with draft help to protect Phillip. Cruz could be an interesting pair with Allen if he can return to prior form though.