Between now and when they scribble their names on their new deals there will be much discussion about each player's value.
Myriad factors come in to play during contract negotiations, but the most important ones are production, injury history (which is usually tied to production) and age (which can be tied to injury history).
Another factor you might hear thrown around when it comes to Cobb and Nelson is the unscientific term "No. 1 receiver" -- as in should either one or both be paid like one?
However, six of the 12 are still playing under their rookie contracts and will be in line for significant raises on their next deal.
Back to the cases for whether Cobb and Nelson belong in that same category as they enter the final season of their current contracts.
According to Williamson, one of them should be considered a No. 1 receiver and the other is close. Also, it's possible for one team to have two No. 1 receivers, Williamson wrote, as is the case with the Bears (Marshall and Alshon Jeffery).
The 6-foot-3, 217-pound Nelson cracked the list at No. 13 under the heading "Just ask their quarterbacks if they are No. 1 receivers." Williamson also put San Francisco's Michael Crabtree in that same category.
"With great size for the position, he is often mistaken for a possession weapon, however only three receivers converted more receptions of 20 or more yards last year, Williamson wrote of Nelson. "His deep speed and big-play ability is vastly underrated, but Nelson also is Aaron Rodgers' go-to target when Rodgers needs a first down and has always proven to be reliable.
"Nelson had his best season in 2013, accumulating over 1,300 receiving yards, and bear in mind that he was playing without Rodgers for much of that time. He isn't a product of the system or his surroundings and would be great in any environment."
Nelson's next contract will be his third. Midway through the 2011 season, he signed a three-year extension that averaged $4.2 million per season. That average ranks 32nd among all NFL receivers in 2014.
Williamson ranked Cobb among 11 players who he termed as "close but not quite" No. 1 receivers.
Cobb, who like Nelson was a second-round pick, is entering the final season of his rookie contract. Two factors likely kept Cobb out of Williamson’s top 14: his size (5-10, 192) and that he missed 10 games last season because of a fractured tibia.
But in 2012, Cobb caught 80 passes despite missing one game, and there is room for growth. He is entering his fourth season but won't turn 24 years old until late in training camp this summer, making him more than 5 years younger than Nelson, who turns 29 in May.