It's not like Gunter is the only "slow" CB they've had.
https://ras.football/2019/12/24/casey-hayward-ras/

FWIW, Gunter was slow and out of his depth trying to be a CB1 covering Julio in the NFCCG. He'd have been fine as your CB4 though.
We're about to find out if Hafley & Co. are any good at developing defensive backs.