I make my claim based on internet research. In Germany, a typical sentence for murder is 15 years. Only severe offences would carry a higher penalty. Again, typically, prisoners are eligible for parole after serving two-thirds of their sentence. Whichever way you dice it, 50 to 60 years of age is a better outcome for CB than 70 to life.
As a relatively young man, the reoffending argument is obviously quite strong. However, parole might be reconsidered after 10 to 15 years of prison time with good behaviour.
With a childhood abandonment, years of physical abuse and significant prison time under his belt, I think CB will have coping mechanisms preventing him from confessing out of despair. He is a transactional thinker: what can I get, what will I lose? He has nothing to gain by confessing.
All MO.