The NFL offseason is a complicated formula of fine-tuning and reinforcing rosters. The Baltimore Ravens weren't uber-aggressive in the early period of free agency, but Eric DeCosta put together a draft class for fans to be excited about.

But, it may not be the new additions that take Baltimore's offense to a next level. Perhaps the most vital additions come from players who are returning from injury.

The Ravens were without second-year running back Keaton Mitchell for most of last season after he tore his ACL late in his rookie campaign. Mitchell returned for the final five games of the season, but he didn't look his usual speedy self. Mitchell took just 15 carries for 30 yards after averaging 8.4 yards per carry as a rookie.

The Ravens are also returning Pro Bowl receiver Zay Flowers,

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