The least Sather can do is hire a GM to split the responsibilities, it's ridiculous that he is President & GM and unfortunately if that doesn't change it's highly unlikely his faulty decision making on free agent additions will change. I also think Girardi will be traded, he's going to want $5+ a year and expanded cap or not he's not worth it, he would be a great addition to a top contender as a #3 or #4 dman. I don't know about Callahan though he strikes me as a guy who wouldn't look to fleece the Rangers, he's a loyal standup guy. I think Glen brings Boyle back for his utility abilities and low salary requirements and I do think he'll resign MDZ unless a team makes him a more than favorable offer.
As far as a team winning the Cup through trades and free agency the LA Kings come to mind.