This. "Low end" C4 is probably the best we can do, and everything would have to align to create the conditions to blunt rapid weakening and/or extratropical transition. There's so much that would factor into whether potential is maximized. But we don't need the highest end cane to have high end impacts.
As I see it, a large and inertially stable C4/C5 hurricane, taking 1) the 1938 track that blasts to Montreal, 2) a hook left to bring the RFQ into NY Harbor, or 3) an eastward slide that brings the RFQ from Groton to Boston are the nightmare scenarios.
The other, which we don't talk about but I think is increasingly on the table given CC, is a scenario where a tropical entity is drawn up into the region using the canonical synoptic setup to bring it here, but we see a collapse of the steering flow as it arrives and a biblical rainfall results. It has happened in the recent past in the south (Imelda, Florence as examples) but I think Henri, for all its failure to deliver wind, was proof of concept in New England.