You can't really change a player all that much, if that's the style Baros has played to get where he is today then he's not going to become a different player now.
Obviously He doesn't fit into Rafa's plans, which I think is right. It seems to me Rafa is trying to put together a side which plays good flowing "pass and move" football, with balls played mainly to feet, a lot of one - twos that sort of thing. This is a weak area of Baros' game, his first touch is average and he has poor link-up play, despite him being able to beat players and create good goal-scoring opportunities, which he filed to capitalise on a lot last season.
He's a good player, yes, but he was never going to be a first-choice striker at a club gunning for the league title consistently IMO, and if Rafa sees fit to get rid then I can't argue.