From the PI.com:

Further tests on Seattle Seahawks linebacker Leroy Hill revealed a "pretty significant groin injury," coach Jim Mora said Wednesday, and he will be out at least the next six weeks.
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This may seem like bad news for Seattle's linebacking corps, but John Morgan over at Fieldgulls believes Hill's injury might be some upside:

Will Herring will take over Hill's snaps. Herring is not Hill's equal as a run defender, open field tackler, or blitzer, but...Herring is a much better pass defender.

Seattle faces five teams between now and the time Hill is expected to return. San Francisco is a traditional offense, beyond traditional, outdated, but Indianapolis and Arizona are pass-first. Chicago is a vertical-style and Jacksonville is a grind `em out, rush-first offense. Herring could be a better matchup against Arizona and Indianapolis.

[I]f Herring is a superior pass defender, it also could be a net improvement to Seattle's defense.