Is a new sign for a cyclic multiverse, so what happened before the big bang? a contracting BB.
In Quantum FFF Theory this should be a so called Galaxy Anchor Black Hole ( GABH) and originaly expelled by the Big Bang BH splitting and pairing process.
The BH splitting and pairing process is supposed to act fully autonomous as observed at small scales in several nebula. see the Spire Eagle Nebula below.
http://scitechdaily.com/astronomers-discover-an-intermediate-mass-black-hole/ So forming dual dumbbell systems ( Herbig Haro systems) to make spiral galaxies in the first place, but later after merging with other galaxies, also Star clusters.
As a consequence:
Galaxy central black holes are only the rersult of a small BH ( supernova BH) merging process first!
SEE : http://www.nature.com/…/jo…/v542/n7640/full/nature21361.html
See : H. Baumgardt: for 40.000 solar Mass BH. https://arxiv.org/pdf/1609.08794.pdf
and also: http://vixra.org/pdf/1702.0109v1.pdf
Black hole splitting and pairing in the Spire Eagle nebula
According to the Quantum Function Follows Form Model, small black holes split larger BHs in equal halves, (A) which are able to repel each other and form Dumbbell shaped Herbig Haro systems (B,C) with star formation in between.
At location (A) both unequal sized black holes seem to split into 4x dual sets of smaller BHs one dual set has even evolved into a second 4x dual sets of BHs.