Jones is the definition of an emergency plug: San Francisco grabbed him off Minnesota's practice squad the moment rookie James Thompson Jr. went down with an ankle injury. He's logged 102 tackles and 6.5 sacks across 60 games with multiple organizations, which tells you exactly what kind of role he's being asked to fill here -- holding the point of attack until the rookie is healthy.
Strengths: Experienced 313-pound nose tackle with a track record of being a reliable waiver-wire fill-in across several NFL stops.
Weaknesses: Has never carved out a long-term starting role anywhere and was signed as pure short-term injury-replacement depth.