Just to add to the choice of reliever discussion, I would go with the best available RP. It doesn't matter if its the closer, the stopper, playing match ups, whatever. I don't think the Tigers have any RP worthy of designating a closer/stopper right now. Chafin is probably as good of a choice as any.
I know some folks would argue to hold the closer (which the Tigers may have in name, but he's hardly shut down) until the Tigers (as the road team) get the lead when the game gets into the 9th or later. I have no problem bringing that best pitcher into a tie game in order to get to the next inning.