Browner is fine better than 90-95% of the short CBs. That dude made a dumb point about height when the highest paid CBs in the league are 200+ and over 6 feet tall. There isn't anything to support that. Your best CBs are quite simply your best CBs. Regardless of height it's who is good at the position.
Height really doesnt matter for a physical corner as much as its made out to be. I think Amadi is plenty physical.