It would be tight with 6. That's 4 people sleeping on pull out sofabeds.
The sofabed in the MBR is jammed in there and pulled out, you would have no walk around room in the MBR.
Note that of all the 5 buildings on the Streamside site, only Evergreen was built by Marriott. Evergreen units are like virtually every other Marriott timeshare rooms. Birch and Douglas are not. They have non-standard layouts. Aspen and Cedar buildings are managed by VRI. All share the same amenities.
The units are tighter than the Marriott standard. The kitchen is galley style, the open living room/dining area is smaller than average. The living room would have very little storage for the people sleeping in that space. The unit does have two bathrooms however.
The first time we took an exchange here, our II confirmation said 4 also. Since we're a family of 5, we packed a blow up bed for the youngest. We were surprised to find a room that slept 6. It was a fine exchange for a ski trip, but it also made me glad that we were out skiing all day long.