Tim Montressor is one the strongest, and most experienced players in the pro division. He has plenty experience winning with the Philadelphia Americans, and it looking to bring that edge to Impact. Impact is the 2nd best team in the world right now right behind Tampa Bay Damage. Picking up Tim is definitely a good move, so they can start there run for the top.
This move may also help but some of the rumors that the American will be making a come back. Montressor was a huge part of Philly for four years, so if there was a comeback one would think that he would be a part of the homebuilding.