We have a pretty serious "vetting" before taking anyone along... track experience is key. Only 1 guy doesn't ride track, but he does 25000+ km per year and is a seriously skilled rider. He keeps up pretty darn well indeed.
Any time we take a new guy along, everyone has to meet each other and see about a fit.
Worst situation we had was 2 guys who didn't see eye to eye, but were civil and still had fun. If the trip was another week longer, it would have gotten ugly. But for a week, all was good.
One other thing -- arrange similarly minded people in rental houses etc. We also do a "food rotation". Instead of having 6 guys trying to fight over the kitchen at supper time, 1 guy cooks each night for everyone. Make up an email/whatsapp/bbm group to sort out who is cooking what on what night. Nothign worse than 5 days of pasta or burgers in a row.
I got a really nice picture of you at the Dragon....
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