Well, the lone little chick died. Not sure if it's worth experimenting more.
Aw, poor little guy; good thing it was a cockerel, but still...aw, I'm sorry for your loss.

That's what I was concerned about, and I don't have any small chicks to try it with right now, so I guess I can count your loss as my experience here.
I'm thinking about the movie "March if the Penguins"; they huddle together through -50 wind and snow for 4 months, on eggs... They can do it, but they're using that massive pile of body heat and feathers to stay insulated. So, when they ship chicks and they want a minimum order of say, 25, that's what's going on. They're cramming that box to the brim and leaving as little space as possible.
So that leads me to think, more chicks in a smaller space would have a better result, possibly?