I thought the "current thinking" on super-massive black holes influencing their host galaxy was not so much the "here-and-now" (i.e. once the galaxy is fully formed) but during the inception/formation phase of the galaxy.
Would this not be similar to a star's influence on a solar system during the initial formation stages. after that, multiple-body interacvtions may take over.
(i realise the analogy breaks down a bit since a solar system is not a galaxy.)
From "small thing" big things come...
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