Replacing Wilson, Affeldt, and Mota on the roster are relative newcomers Clay Hensley, Travis Blackley, and Steve Edlefsen. Of the three, Hensley is the only one who can really say that he's a major leaguer as Blackley and Edlefsen have combined to throw 54.1 career innings with an ERA well over 8.00. After seeing them pitch in the first 30 games, this seems somewhat apparent as Hensley has distinguished himself so far as a pretty strong late-inning option. His sub-3.00 ERA and FIP are sure impressive, but for a ground-ball pitcher to post a K/9 over 9.00 is just dominant. If he can keep up these numbers and post a season similar to his fantastic 2010 as opposed to his dreadful 2011, Hensley could prove to be a huge pickup.
After Hensley, the new blood starts getting a little more concerning. Blackley is the next most experienced pitcher as the 29-year-old has played everywhere from Mexico, to Korea, Philadelphia, Seattle, and of course his native Australia. While all that experience is certainly a good thing to have, it's not a good endorsement in Blackley's ability to pitch well as he has never played well enough to stick with a team. The Giants are hoping that somewhere between Korea, where he spent 2011, and his great start in Fresno this year Blackley somehow figured out the secret to success. He's looked decent in the four innings he's pitched so far, but his absolutely terrible career numbers give less room for optimism: 5.35 K/9, 6.75 BB/9, and 2.56 HR/9 albeit in only 38.2 innings.
And last and probably least we have Steve Edlefsen who at 26 years old is still with the same team who drafted him, the San Francisco Giants. Still unlike most of the Giants homegrown pitchers, Edlefsen just doesn't have the ability to consistently put away big league hitters. The sinker-baller has only ever seen the show as a member of the 40 man roster last September and he was anything but effective as his ERA was over 9.00 and his K/BB was well below one. His history in the minors isn't very encouraging either as his K/BB sit well below two in six seasons in the minors, which is not good, even for a sinker-baller.
Bochy will have to utilize his firemen wisely as he'll have to get by with only four solid arms and two that you'll let burn up some innings, but don't want to rely on to keep you in the game. Considering how low scoring of a team the Giants are, this extra strain on the relief corps could be the needle that breaks the camel's back as almost every inning and every outing is a critical one that can make or break the team's fragile leads.