4 1000 yard seasons for Nelson, 1 for Cobb. Nelson did have a torn ACL 2 years - but he did have 97 for 1200+ and 14 TDs in 2016, so I'm not sure that affected him much. Both had kind of bad years last year because Hundley was terrible. 27 vs 32 in age, but Nelson clearly means more to Rodgers than Cobb IMO.
My opinion? Cut Cobb, let Nelson possibly walk in 2019, and replace through the draft. Should net a comp pick if nelson signs elsewhere. Gives Adams one more year to take the #1 mantle, and slot receivers usually come cheaper.