"These black holes plow through the dense gas within their host galaxy, it creates a dynamical friction, or drag, that causes them to rapidly migrate towards the galaxies center. There, they can merge to form a single black hole with 10,000 to 100,000 solar masses. This process progresses extremely quickly taking just 50 to 100 million years. After that, the researchers said in a press release, the central black hole will grow quickly: "In light of this theory, we can state that 800 million years after the Big Bang, supermassive could already populate the cosmos."
Astronomy Magazine March 2021 "How to Grow a Giant Black Hole" pp. 16-23
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