Given the average litter size, 7 fluffies is one, maybe two family units (a pair of special friends and 1-5 foals), so hardly a herd.
You’re missing two other types of smarty, both of which are extremes of your two categories; hellgremlin types (Crimson from BFM101’s The Josef Mongola series is a good example) and the smarty friend, which is a good leader type (No-lips from On The Rocks by Giant_Neckbeard is the best example I’ve read).
No-lips’ herd is also the biggest one I know of (I think 20-30 adult fluffies not including colts/fillies, foals and chirpies), outside the megaherds encountered in the Fall of Cleveland saga.