I believe they adopted a structure more similar to the Luppino family rather than Rizzuto. The Luppino family have been associates of the Buffalo family for decades and they are more low key compared to other organized crime figures.. It is a theory, but could it be that the decline of Buffalo organized crime over the years have given the Luppino's (Ndrangheta) a more important role into the Buffalo organized crime affairs. This would explain maybe why law enforcement believed it was dead.
Buffalo's Canadian counter parts which had remained unscathed,was a life line for what remained of the Buffalo organization.
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It would make sense if it is working for them a short distance away why not adopt It?

Also would.there really be a need to have a full hierarchy in place
???

How would that benefit the family in the now?
They will never be what they were, no more commission in place so could they get by make money and stay under the radar as a glorified crew? Or crews?