The Cubs have often tried to get Imanaga an extra day of rest, so why wouldn't they do the same here? Horton on 6 days rest followed by Imanaga on 5 days rest makes more sense than Imanaga on 4 followed by Horton on 7. I feel like if they planned on Imanaga to go in Game 1, they would have lined up the rotation differently for this week.