Agreed that the most likeliest is Lockridge moving ahead of Perkins with a hot spring (although with the way that Murph speaks about Perkins, it could take a lot).
Before the late winter trades, I would have said Eddys Leonard. The reasons: signed early in the fall (showing real interest from the Brewers), out of options, versatility on defense, some pop in the minor leagues. But, the powers that be have really spoken highly of David Hamilton so it would be a surprise to see that switch.