In NAZ's defense, I don't think that thread answers the question really. That one is more about a specific water level, NAZ's is more about the experience level of the group and general water levels (or various water levels).
That's a family friendly section of river, and lots of people take even small children down there. It's pretty "recreational" in nature. If they have any paddling experience at all and can swim (hopefully they won't need to!), I don't think you'll have any problems.
We're going to be on the San Juan then too, we'll look for two IK's and two hardshells!