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49ers roster: Early bubble watch after adding Arden Key, Maurice Hurst

Arden Key #99 of the Oakland Raiders (Photo by Stephen Maturen/Getty Images)

The 49ers defensive line is deep again after the team inked free-agent linemen Arden Key and Maurice Hurst, prompting questions about the roster bubble.

Earlier this week, the San Francisco 49ers reinforced their defensive line depth by plucking away two former Las Vegas Raiders defensive linemen, Arden Key and Maurice Hurst.

These two low-risk, potentially high-reward moves were smart in a number of ways. For starters, the Niners are betting a small amount on both players’ upsides, hoping Key and Hurst can turn around careers that ultimately flamed out in Las Vegas.