It might seem like a lifetime ago in this world of a news cycle the length of a tweet, and it might seem more distant still in the wake of the Cubs’ signing of ace free-agent Yu Darvish this past weekend. But on his way out, Arrieta deserves some form of thanks for helping to make the Cubs champions for the first time in more than a century but especially for his legendary 2015 that tore into the first half of 2016.