Were past what I could confidently answer (if I'm wrong hopefully someone corrects me) but I'm not sure I follow, if the BH grows it would encompass what we see as nearly smeared over it's horizon.
There's also surprising results around what the external gravitation field appears to be for an object.
I.e. no matter how mass is distributed behind the event horizon externally it looks like the spherically symmetric Schwartzchild metric.
That has implications for what will emit gravitational waves.
Eithway, smeared over the horizon but never crossed and crossed the horizon externally look the same from a gravity perspective.
There's also surprising results around what the external gravitation field appears to be for an object.
I.e. no matter how mass is distributed behind the event horizon externally it looks like the spherically symmetric Schwartzchild metric.
That has implications for what will emit gravitational waves.
Eithway, smeared over the horizon but never crossed and crossed the horizon externally look the same from a gravity perspective.