BUT I still think 100 dives isn't really enough to be an instructor...
That's a quote from ME...
I didn NOT say 100 dives were enough to be an instructor, that it was I am ABOUT to take an instructor course...
All I'm saying is that I've been working in a dive center for 6 months, and I've seen all of the situations you're describing, because the center's boss actually gave me do an Instructor job.
I've been leading a group of 8 divers with 4 divers with practically no-dives before (yes, the center was a bit of an unorganized one).
Wreck penetrations = 10 (I love it)
Deepest dive = 65 meters
Number of deep "more than 40 meters" dives = about 20.
And, Oh, BTW, i'm french, and in France there is not such a huge difference between DM and Instructors. What I'm about to pass is the "Niveau 4 Inititiateur", and what you can do with that is :
Deliver "Niveau 1" (-> OW), provided an Instructor validates the course at its end.
Lead all types of dives
Do "baptisms" (first dives)
Help the Instructor in the "Niveau 2 et 3" courses (-> Adv OW and Rescue Diver)
I think I'm ready to do that, maybe I'll need to be helped for the beginning of it, but I've already done it in a non-legal way.
I think the fact that I can't do any course higher than the "Niveau 1" can make a difference, sorry you didn't know that. Maybe it got you confused...
Cheers.