I never thought Calvin was "good"...just "big" and he had a QB in Stafford who would just chuck the ball up to him...
He has always been slow...his route running has always been poor...
Seen this dude get hawked down by safeties and linebackers in the open field...seen corners in his hip pocket all day...he is just so much bigger than them that he can just snag the ball out the air...but they be right on his ass...
Like watching Antonio Brown run routes and watching Megatron run routes...you'd never guess they play the same position...
Physically gifted and an athletic freak...but if the average corner was 6"2" instead of 5"10" he would be in trouble...