The news that McClung had signed with the Rangers was broken by Jerry Crasnick yesterday, and with him reporting it was a split contract, I assumed it was a major league deal. Andro's tweet, though, seems to indicate it is a minor league deal.
Crasnick said earlier today that McClung will earn $700,000 from the Rangers if he makes the team, with another $700,000 possible in incentives based on starts.
Chavez, meanwhile, will presumably have a chance to fill the role he was expected to fill in 2010 -- minor league insurance for Julio Borbon, and a potential fifth outfielder. The Rangers really like Craig Gentry, and I would think that Gentry would be ahead of Chavez in the pecking order, but if Borbon struggles (or is dealt), you could see Chavez in Texas.
Barden, I suspect, is simply a guy added for minor league infield depth.