Many teams with playoff aspirations have been foiled by an unsettled bullpen. This perfectly describes the Cards for most of the season last season, & then they traded for bullpen depth (sending away a very talented young player) & 'pen guys got hot, especially in the postseason. Just shows how unpredictable & volatile RP production can be over the course of a season/half-season/quarter-season. Who is going to step in? I know that the clever answer is 'whoever fits the situation best', but that ain't happening. I know you're a diehard Brewers fan, but I think you're really missing a lot of options here. If you're talking for just one season... Peralta, Fiers, Manzanillo, Rogers, & Braddock are all guys who could conceivably step in and throw well over 60-70 IP. (I personally wouldn't want to mess with Peralta as a SP, but he's an option if one would want to consider letting him grow against MLB hitters from the bullpen)