It seems unlikely the Jets will pursue Dustin Keller in free agency. There are many options, including the draft, however there is a solid option in 49ers tight end Delanie Walker. Walker will be free agent for the 2013 season and is severely underrated.
Walker is a hybrid tight end who can create plays with his feet and speed (4.49 40yd dash). Although he is only 6 feet tall he packs a punch with his 242 lb frame. He poses a threat for opposing defenses with his versatility. Jim Harbaugh has praised Walker saying that his skill set has proven useful in a west coast offense.
Walker is overshadowed by the play of Vernon Davis, however if given the right situation he can make an immediate impact. Walker is seasoned (7 years of experience) player who blocks well and is instinctive. Say Keller departs, Walker could pair nicely with Cumberland and help bail out Sanchez in tough situations. Although he played sparingly this season, Walker contributed snagging 21 passes for 344 yards and three touchdowns. He has big play capability and is ready to solidify his career. At 28 he has time to progress and isn't a risky investment.
Walker should be a cost-effective move. If the space is in the salary he should be pursued. The 49ers value him, however they are not looking to increase his salary by much. Walker is an interesting prospect to pursue and further look into. He won't want to sit behind Vernon Davis much longer and other teams may pursue the unique tight end. With Keller's value dropping it is time to look into other options.