With the 2013 MLS regular season opening weekend at hand, the plethora of roster moves in the offseason will finally get to be judged via results on the field. In both the Eastern and Western Conferences, teams that struggled last year went about trying to fix their problems as aggressively as their budgets would allow. For the 10 postseason participants in 2012, the job was simply to make sure the team was set up not to relinquish that standing this season. So which transactions will prove to be the difference makers in 2013? We look at 5 that will make a team’s fortunes and 5 that will consign them to watching the playoffs from the outside.