Thanks for your answer Bigsplit sorry I did
not see it yesterday. Should have scrolled up
more. Dont think we need Heisenberg here in
classical territory. I think I read somewhere
that gravitational waves do not carry energy
so no absorption would seem possible. But then
what the hell are they

The fast speed of neutron stars I understood
to be the result of unsymmetrical collapse
of supernovae. After all only a manmade gadget
achieves true uniform implosion because it is
made to.(you know what!) A supernova must
start at one point of the final burning shell
and the infalling spread out from this point
around the shell. Must be in the models that
people try. And spin comes in somewhere I
suppose.