my Ridgid 6" is about 22 inches wide, and the Grizzly guide tube looks to extend further out behind the fence than my jointer does. The 27 inch measurement is probably from the end of the guide tube to the rabbeting ledge.
The base of my jointer with the mobile base on it is around thesame 22 inch width, I don't know about the Grizzly.
If you're wanting to see one up close, grizzly may be able to put you in contact with someone nearby who owns the machine.
From the Grizzly website
"Where can I see your machines?
You can see our machines at one of our three retail stores located in Springfield, MO, Muncy, PA and Bellingham, WA. You can also call our Order Desk at (800) 523-4777 and ask the operator for a reference from someone who lives in your area that purchased the particular machine that interests you. Please be ready to provide the model number(s) of the machine(s) you are interested in and your zip code.
As far as we know, we are the only seller of woodworking and metalworking machinery that gives out customer references so you can get an unbiased opinion on our products."