We should probably wait a while before lamenting the failure to sign Darvish. He's already on the DL, has a history of high usage, and plays for a manager that puts more pitchers on the DL than Dusty Baker. Sure he's great now, but wait to see where he's at in a year or two, or if his arm is still attached.
Besides that, all three of these guys signed with three different teams. You can lament over not getting one of them and even make a case that they were "outbid", but nobody got all three, and from what I can tell, the Cubs were the only team that was heavily in on all three to the end. I know that there is no "a for effort", but it's not like the Cubs didn't do what they thought needed to be done to get all three of these guys.