For Emmanwori, it's value and knowing that this is likely Honey Badger's last season here. Why not replace him with a physical freak who's a monster against the run and mobile QBs and decent in coverage. Mukuba because he's quick, instinctive, has played nickel corner as well as free and strong safety and hits like a Mack truck despite being a little on the light side. Also gives us positional versatility because we really don't know if Alontae is going to stick around here or (more likely) go to the Bears under DA and become a superstar in a larger market. Mukuba grants us flexibility for the future as well as not having to teach a guy how to play nickel corner.