As a result the longer the route of the photon, the larger the redshift in our eyes.
Black Holes, do not eat EQUAL SIZED BLACK HOLES, they repel each other into Herbig Haro dual bowshock Systems, to form stars in between.
However, Black Holes only eat different sized other Black Holes and the radiation including the vacuum particles, with the vacuum dilution as a result!
(Planck length extension)
The result we may explain.
Conclusion, the universe is cyclic .