I too have a last minute entrant. He is not active on this forum but a Husky rider with an itch
Not sure about the route (in that I'm game for anything do'able) so I'll probably hew towards my guest's comfort level unless he is (like really) bigtime slow AND finds a comrade-in-crawl to track with him. If the group gets big enough we may want to consider pairing off with the fast riders out front and groups of two-to-three staging each leg with a timed-release mode of travel to keep us spread out and the dust eating minimized.
BTW here is the the route we did last week in Google Maps (ignore the start and end points as I staged at a different locations from the others)
Got new rubber this week so I'm ready for some fun!