Chris Kelly's help you win in the playoffs because they adapt.
Iginla, who I was a huuuuuuuuuge fan of as a regular season player, did not adapt to the playoffs, did not show leadership, did not show grit, did not appear to understand what was required.
Kelly ratchets up the battle and the smart play when the team needs it.
Iginla just kind of coasts along and hopes for the best.
If Kelly played, they probably win the series. Kelly will help a team in the playoffs wherever he goes. Iginla very well may not, even if he gets 1st line minutes and pp time.