Because of Varland's control, we have a good chance of winning this trade. If Varland is an elite reliever over the duration of his tenure and/or converts to an effective cost controlled SP (very unlikely I think), we win. If Varland gets huge outs down the stretch and throughout the playoffs it's almost a moot point on who 'won', we'll take it.
If Rojas turns into an effective starter or Roden becomes a league average everyday player, they 'win'. The most likely outcome is that Rojas turns into a Varland level reliever in his pre-arb years and Roden becomes a decent bench player which is relatively even.