As predicted, Joe Lstiburek wrote some good commentary on the Grenfell Fire. It can be found at this link here. He makes several interesting points about fire safety in the context of cladding systems with exterior insulation. Among these are a criticism of excessively large rainscreen gaps--3/8" is plenty-- and the importance of fireblocking between window heads and combustible exterior insulation. He doesn't comment on the overall thickness of the poly-iso insulation used in the cladding retrofit. They could have used a little bit of the money saved by using only 4" of insulation to buy a non-combustible aluminum composite panel.
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