The gravitational redshift has nothing to do with the expansion of the universe but mainstream cosmologists are not very impressed:
http://www.wired.com/wiredscience/2011/09/galaxies-einstein-relativity/ "The researchers, led by Radek Wojtak of the Niels Bohr Institute at the University of Copenhagen, set out to test a classic prediction of general relativity: that light will lose energy as it is escaping a gravitational field. The stronger the field, the greater the energy loss suffered by the light. As a result, photons emitted from the center of a galaxy cluster - a massive object containing thousands of galaxies - should lose more energy than photons coming from the edge of the cluster because gravity is strongest in the center. (...) The effect is known as gravitational redshifting."
In contrast, the anomalous quasar redshift acts like the face of Medusa the Gorgon - on seeing it, mainstream cosmologists get petrified and remain in that state for long periods: