I do think that the larger question here (not Springer last night) is general bullpen usage. Do you use one of your three better relievers even though you may be down one run? Can you bring in your closer before the 9th inning? What about in the 6th with the bases loaded in a tie game? Should a team save pitchers to be used only with a lead, or to start an inning? I think, generally, that teams are too conservative with their best relievers and may not use them when they can make the most difference.
Garner, it seems to me, isn't radically different from most other managers, though I'd like to read more about it.