jesús hernández is a lower slopes domestique. He'd probably be able to get a contract without alberto, but it would be at a team like andalucía rather than at a pro team. Noval is an engine for the flats. He didn't have his best year in 2011, but he's still capable. No, he isn't bert grabsch or txente garcía, but domestiques like those are the exceptions, not the norm.
Also, those guys are not dead weight. Keeping your top level star happy is an important factor for making sure he doesn't go anywhere. Having his close friend and training partner in the team is good for his morale. Just because he isn't doing a sylwester szmyd job doesn't mean he can't be a mountain domestique; often a lot of his best work is done before the race is even on the air.
Hernández is a thoroughly reasonable pro mountain domestique. No, he isn't niemiec or szmyd, but having him around keeps contador happy, and besides he has navarro to do that job.