Innings aren't everything either. K-Rod is only #12 in total pitches, Will Smith is #26, Thornburg is #46, and Duke is #71. I also see no reason to think that K-Rod is incapable of throwing 96 innings. Relievers generally don't throw that many simply because they don't have an opportunity to. Last season Anthony Swarzak threw 96.0 IP for the Twins (all in relief) and was pretty good (2.91 ERA, 3.28 FIP). In 2011, Jonny Venters appeared in 85 G for the Braves (88.0 IP) and was lights-out: 1.84 ERA, 2.78 FIP. Obviously, we likely are not going to win >120 games, so that is likely not going to be an issue, but even if it was I don't see how it is a concern whatsoever. Besides, best to ride him while he's hot. If his arm falls off just use Henderson as the closer again (or Thornburg, or Smith, etc.)