How are the 49ers’ free-agency additions looking at camp? Yiadom leads the pack

SANTA CLARA — The signing of cornerback Isaac Yiadom was mostly under the radar last March 18, the same day Leonard Floyd arrived as a bookend to Nick Bosa and linebacker De’Vondre Campbell came aboard as a potential solution to Dre Greenlaw’s likely early-season absence while rehabbing a torn Achilles.

But if eight training camp practices are any indication, Yiadom will be a key contributing member of the 49ers’ free-agent class after blossoming as a cover corner in eight starts last season with the New Orleans Saints.