Extra day for Arrieta to rest can only benefit Cubs

Remember the Cubs’ last postseason rain delay? Yeah, thought so. That one in Game 7 of the 2016 World Series didn’t exactly sink the Cubs, and neither should Tuesday’s postponement of Game 4 in the National League Division Series presented by T-Mobile. It’s just one more day for Jake Arrieta to rest his hamstring and prepare to do what he’s done best over the last three seasons — deliver some of the biggest wins that the Cubs have collected.