6z Euro vs 0z. You can see better ridging north of the Great Lakes at 6z, likely caused by the stronger trough off the east coast, and a slightly weaker vort hitting the NW coast (that's the 1/6 system.) All of that would increase chances of a 6z Gfs scenario imho by pushing a slightly weaker system to the south of its cutter depiction on the Euro's 0z run. Plenty of time to change, and likely with each run until we're closer.
P.s. I don't think the fact the 1/6 system is shown coming in slightly north would make a difference due to stronger ridging north of the GL. Again, jmho.