What point?
I saw no point in the quoted text.
The sun cannot simultaneously hold the plants within its hill sphere yet not have something crumble within its Roche limit.
And comets aren’t supertuff.
A good portion are best described as frozen shaving foam.
Well the Roche limit is dependent upon the internal dynamics of the affected object. And the Hill sphere does not come into play, because ISON’s median outgoing trajectory has nothing to do with the exit spread of disrupted or shattered nucleus objects.
But hey, whatever. In a few weeks we’ll know one way or another.