Good, Bones. That plume has had me intrigued from the first. Whatever the object is/was, insulation from the ET, ice, or a combination of the two, it was large before the impact.
As far as the plume, I wonder if the size would be consistant with only the object being shattered. Personally I don't think so, but that is only MHO.
Yes, that is precisely my point. The plume appears too large to be from only ET insulation or only ice. The plume is larger because it may include a substantial amount of pulverized TPS.