Number 2: Brad Richards
Arguably one of the best full season pickups for the Blackhawks during their dynasty run, Brad Richards made a huge difference for the Hawks during their 2015 playoff push. Not to mention his 37 points in 76 games during the regular season.
Brad came in being a veteran, as he won the Stanley Cup with the Tampa Bay Lightning in 2004 and helped his New York Rangers make it to the Stanley Cup Final the year before in 2014. For the Hawks, he had 14 points in 23 Stanley Cup Playoff games. 11 of those points were assists, as he was one of the best play makers other than Patrick Kane on the 2015 playoff roster.
Number 1: Antoinne Vermette
Just as one could argue Brad Richards was one of the best full season pickups for the Hawks during the dynasty run, Antoine Vermette was the best trade deadline acquisition during this time for Chicago. 7 points in 20 playoff games does not sound like a legendary number at first, but Vermette had 3 game winning goals during the 2015 Stanley Cup Playoffs.
His initial transition from being depended on in Arizona to being a third line center for the Blackhawks hit him hard. Interestingly enough, Vermette was scratched for 2 playoff games, but his impact was huge. Vermette was a plus 5 during the playoffs. As well as having a 59% face-off winning percentage. He truly embodies what a nice trade deadline rental acquisition for the playoffs should be. In the end, he earned himself a Stanley Cup and is responsible for some of the most memorable Blackhawks wins during the 2015 Stanley Cup run.
All stats courtesy of HockeyReference.com