Great post by one of the Mets in the MA Forum!
If the meat of that developing advection lobe continues to trend west along the major axis here, the surface depiction will change in a hurry. Notable improvement at H5 already (in the same direction as the GFS/AIGFS, even if the ECAIFS only nudged a bit initially). Holding it back right now a bit is the trend in the lobe over SE Canada.