The key to the day 8-10 threat is what the tail of the TPV does.
We need the tail of the trough to break off a SW and dig into the east...which will in turn create some separation between the 50/50 and pump some ridging along the east coast. If that trailing SW moves more east and misses the connection with the STJ everything will likely be suppressed. If something digs into the MS/TN valley we likely get a storm up the east coast.