Lackey is making 16 million next year, and league minimum the following year. If they try to trade him, he would arguably be worth more than any other free agent starting pitcher, and more than any other possible trade candidates besides Price. If someone was willing to give up an elite prospect like the Will Myer for Shields deal, it might be good to sell high. Otherwise, he has pitched way to well to get kicked off the team.
Felix Doubront may be the guy they trade. His work ethnic doesn't seem to be as high as the rest of the group, and with 4 more years of control, he may pull in a quality piece as well.