I believe I made some of those same arguments over on the CD forum, Chris awhile back and the answer was in a nutshell, don't ruffle the "creative's" feathers or they'll refuse to work with you again. I hadn't read the sig sheets had been in someone's hands for over a year. That's ridiculous.
Jeff makes some exactly points as I'm sure there are plenty of talented, starving artist out there who could get the work done in a timely matter. I'm sure there are probably a ton of other reasons it's been delayed so long that CD can't or won't discuss openly.