While the exact details of the track are still uncertain, it does seem pretty likely at this point that the general idea is…that. It is important to note that Dorian will likely weaken to a tropical storm within a couple of days after landfall (or its closest approach to it), but as you show in the second plot, it will still dump tremendous amounts of rain. Flooding will be a very major concern, especially for coastal areas.
As for the GFS itself… I’d proceed with caution on its solution particularly for precipitation amounts. The general idea is right, but I see that the GFS puts the bulk of Dorian’s precipitation in the left-front quadrant as it moves along the East Coast, which isn’t impossible but seems a bit off given the typical behavior of post-landfall tropical cyclones. Therefore, the precipitation amounts over land are likely at least somewhat overblown, not that it matters much when you’re arguing which side of 1 foot it’ll be on. Flooding will be the largest concern by far as Dorian moves northward — its winds will be far weaker once it begins persistently interacting with land.