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Don't over think this! If you are opening the bleeders and the calipers don't release, then it's got to be the calipers. There is no spring inside the calipers, the only thing that draws the piston back is the lack of pressure hyd. pushing it out (vacuum?)

Sounds stupid, but are you sure the calipers are sticking? I haven't had a rotor turned in years and never measured runout but could that be the problem? Remember the piston only moves back a few thousands when pressure is released, if the rotor is rough or has essive runout then it's possible...