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If the escape velocity at the event horizon is exactly c then doesn't it follow that light having this exact velocity should still be able to escape? It it was c+n then that would exceed light speed. Can someone explain this?
Once light can't escape, gravity overcomes all forces that hold matter apart and keep it from collapsing (since they are, at the fastest, transmitted at light speed). So going past that critical limit automatically implies collapse, unless some new physics comes in that we don't yet know about.
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REGISTER or LOGIN - once the pressure in the core exceeds the pressure which can be sustained by neutron degeneracy (or perhaps by a hypothetical quark-gluon soup), it will collapse to a black hole.